Solving by Simplifying Both Sides
To solve the equation , 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: . On the right side, combine the three like terms by adding their coefficients: , so . The equation becomes:
Step 2 — Isolate the variable using the Division Property of Equality: Because is multiplied by the coefficient , divide both sides by :
Step 3 — Check the solution: Substitute into the original equation:
14 - 23 stackrel{?}{=} 12(-3) - 4(-3) - 5(-3)
-9 stackrel{?}{=} -36 + 12 + 15
-9 = -9 checkmark
Because both sides are equal, 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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