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Simplifying x + 5 + (x + -9) = 90 Reorder the terms: x + 5 + (-9 + x) = 90 Remove parenthesis around (-9 + x) x + 5 + -9 + x = 90 Reorder the terms: 5 + -9 + x + x = 90 Combine like terms: 5 + -9 = -4 -4 + x + x = 90 Combine like terms: x + x = 2x -4 + 2x = 90 Solving -4 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + 2x = 90 + 4 Combine like terms: -4 + 4 = 0 0 + 2x = 90 + 4 2x = 90 + 4 Combine like terms: 90 + 4 = 94 2x = 94 Divide each side by '2'. x = 47 Simplifying x = 47
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