Solving by Collecting Variables
To solve , first observe that variable terms appear on both sides of the equation, while the constant appears only on the right. Designate the left side as the variable side and the right side as the constant side.
Step 1 — Remove the variable term from the constant side: Since is on the constant side, subtract from both sides using the Subtraction Property of Equality:
Step 2 — Simplify: On the left, . On the right, , leaving just :
Because the coefficient of is already , no further division is needed.
Step 3 — Check by substitution: Replace with in the original equation:
Because both sides are equal, is confirmed as the correct solution. This example demonstrates that when the variable appears on both sides of an equation, the first step is to subtract the smaller variable term from both sides so that all variable terms are collected onto one side.
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Ch.2 Solving Linear Equations and Inequalities - Elementary Algebra @ OpenStax
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