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Simplifying 138 = 6(3 + 5x) 138 = (3 * 6 + 5x * 6) 138 = (18 + 30x) Solving 138 = 18 + 30x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30x' to each side of the equation. 138 + -30x = 18 + 30x + -30x Combine like terms: 30x + -30x = 0 138 + -30x = 18 + 0 138 + -30x = 18 Add '-138' to each side of the equation. 138 + -138 + -30x = 18 + -138 Combine like terms: 138 + -138 = 0 0 + -30x = 18 + -138 -30x = 18 + -138 Combine like terms: 18 + -138 = -120 -30x = -120 Divide each side by '-30'. x = 4 Simplifying x = 4
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