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Simplifying 2x + (x + -3) = 90 Reorder the terms: 2x + (-3 + x) = 90 Remove parenthesis around (-3 + x) 2x + -3 + x = 90 Reorder the terms: -3 + 2x + x = 90 Combine like terms: 2x + x = 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 = 93 3x = 93 Divide each side by '3'. x = 31 Simplifying x = 31
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