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Simplifying x + (2x + 4) + -1(x + -3) = 90 Reorder the terms: x + (4 + 2x) + -1(x + -3) = 90 Remove parenthesis around (4 + 2x) x + 4 + 2x + -1(x + -3) = 90 Reorder the terms: x + 4 + 2x + -1(-3 + x) = 90 x + 4 + 2x + (-3 * -1 + x * -1) = 90 x + 4 + 2x + (3 + -1x) = 90 Reorder the terms: 4 + 3 + x + 2x + -1x = 90 Combine like terms: 4 + 3 = 7 7 + x + 2x + -1x = 90 Combine like terms: x + 2x = 3x 7 + 3x + -1x = 90 Combine like terms: 3x + -1x = 2x 7 + 2x = 90 Solving 7 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2x = 90 + -7 Combine like terms: 7 + -7 = 0 0 + 2x = 90 + -7 2x = 90 + -7 Combine like terms: 90 + -7 = 83 2x = 83 Divide each side by '2'. x = 41.5 Simplifying x = 41.5
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