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Simplifying x + (x + -7) + 2(x + -7) = 87 Reorder the terms: x + (-7 + x) + 2(x + -7) = 87 Remove parenthesis around (-7 + x) x + -7 + x + 2(x + -7) = 87 Reorder the terms: x + -7 + x + 2(-7 + x) = 87 x + -7 + x + (-7 * 2 + x * 2) = 87 x + -7 + x + (-14 + 2x) = 87 Reorder the terms: -7 + -14 + x + x + 2x = 87 Combine like terms: -7 + -14 = -21 -21 + x + x + 2x = 87 Combine like terms: x + x = 2x -21 + 2x + 2x = 87 Combine like terms: 2x + 2x = 4x -21 + 4x = 87 Solving -21 + 4x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 4x = 87 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = 87 + 21 4x = 87 + 21 Combine like terms: 87 + 21 = 108 4x = 108 Divide each side by '4'. x = 27 Simplifying x = 27
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