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Simplifying (x + 7) + (2x + -12) + (3x + 4) = 90 Reorder the terms: (7 + x) + (2x + -12) + (3x + 4) = 90 Remove parenthesis around (7 + x) 7 + x + (2x + -12) + (3x + 4) = 90 Reorder the terms: 7 + x + (-12 + 2x) + (3x + 4) = 90 Remove parenthesis around (-12 + 2x) 7 + x + -12 + 2x + (3x + 4) = 90 Reorder the terms: 7 + x + -12 + 2x + (4 + 3x) = 90 Remove parenthesis around (4 + 3x) 7 + x + -12 + 2x + 4 + 3x = 90 Reorder the terms: 7 + -12 + 4 + x + 2x + 3x = 90 Combine like terms: 7 + -12 = -5 -5 + 4 + x + 2x + 3x = 90 Combine like terms: -5 + 4 = -1 -1 + x + 2x + 3x = 90 Combine like terms: x + 2x = 3x -1 + 3x + 3x = 90 Combine like terms: 3x + 3x = 6x -1 + 6x = 90 Solving -1 + 6x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 6x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 6x = 90 + 1 6x = 90 + 1 Combine like terms: 90 + 1 = 91 6x = 91 Divide each side by '6'. x = 15.16666667 Simplifying x = 15.16666667
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