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Simplifying (12x + 3) + (6x + -3) = 90 Reorder the terms: (3 + 12x) + (6x + -3) = 90 Remove parenthesis around (3 + 12x) 3 + 12x + (6x + -3) = 90 Reorder the terms: 3 + 12x + (-3 + 6x) = 90 Remove parenthesis around (-3 + 6x) 3 + 12x + -3 + 6x = 90 Reorder the terms: 3 + -3 + 12x + 6x = 90 Combine like terms: 3 + -3 = 0 0 + 12x + 6x = 90 12x + 6x = 90 Combine like terms: 12x + 6x = 18x 18x = 90 Solving 18x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '18'. x = 5 Simplifying x = 5
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