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Simplifying x + 2(x + 5) + -7 = 90 Reorder the terms: x + 2(5 + x) + -7 = 90 x + (5 * 2 + x * 2) + -7 = 90 x + (10 + 2x) + -7 = 90 Reorder the terms: 10 + -7 + x + 2x = 90 Combine like terms: 10 + -7 = 3 3 + x + 2x = 90 Combine like terms: x + 2x = 3x 3 + 3x = 90 Solving 3 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3x = 90 + -3 Combine like terms: 3 + -3 = 0 0 + 3x = 90 + -3 3x = 90 + -3 Combine like terms: 90 + -3 = 87 3x = 87 Divide each side by '3'. x = 29 Simplifying x = 29
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