Example

Solving 1423=12y4y5y14 - 23 = 12y - 4y - 5y by Simplifying Both Sides

To solve the equation 1423=12y4y5y14 - 23 = 12y - 4y - 5y, begin by reducing each side to its simplest form before isolating the variable.

Step 1 — Simplify each side independently: On the left side, subtract the constants: 1423=914 - 23 = -9. On the right side, combine the three like terms by adding their coefficients: 1245=312 - 4 - 5 = 3, so 12y4y5y=3y12y - 4y - 5y = 3y. The equation becomes:

9=3y-9 = 3y

Step 2 — Isolate the variable using the Division Property of Equality: Because yy is multiplied by the coefficient 33, divide both sides by 33:

93=3y3\frac{-9}{3} = \frac{3y}{3}

3=y-3 = y

Step 3 — Check the solution: Substitute y=3y = -3 into the original equation:

1423=?12(3)4(3)5(3)14 - 23 \stackrel{?}{=} 12(-3) - 4(-3) - 5(-3)

9=?36+12+15-9 \stackrel{?}{=} -36 + 12 + 15

9=9-9 = -9 \checkmark

Because both sides are equal, y=3y = -3 is confirmed as the correct solution. This example highlights a key difference from simpler equations: both sides required simplification — the left side needed arithmetic on constants, while the right side needed combining like variable terms — before a property of equality could be applied to solve for the variable.

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Updated 2026-04-21

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