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Simplifying 138 = 2x + 4(2x + 7) Reorder the terms: 138 = 2x + 4(7 + 2x) 138 = 2x + (7 * 4 + 2x * 4) 138 = 2x + (28 + 8x) Reorder the terms: 138 = 28 + 2x + 8x Combine like terms: 2x + 8x = 10x 138 = 28 + 10x Solving 138 = 28 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 138 + -10x = 28 + 10x + -10x Combine like terms: 10x + -10x = 0 138 + -10x = 28 + 0 138 + -10x = 28 Add '-138' to each side of the equation. 138 + -138 + -10x = 28 + -138 Combine like terms: 138 + -138 = 0 0 + -10x = 28 + -138 -10x = 28 + -138 Combine like terms: 28 + -138 = -110 -10x = -110 Divide each side by '-10'. x = 11 Simplifying x = 11
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