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Simplifying (6x + -3) + (3x + 15) = 90 Reorder the terms: (-3 + 6x) + (3x + 15) = 90 Remove parenthesis around (-3 + 6x) -3 + 6x + (3x + 15) = 90 Reorder the terms: -3 + 6x + (15 + 3x) = 90 Remove parenthesis around (15 + 3x) -3 + 6x + 15 + 3x = 90 Reorder the terms: -3 + 15 + 6x + 3x = 90 Combine like terms: -3 + 15 = 12 12 + 6x + 3x = 90 Combine like terms: 6x + 3x = 9x 12 + 9x = 90 Solving 12 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 9x = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 9x = 90 + -12 9x = 90 + -12 Combine like terms: 90 + -12 = 78 9x = 78 Divide each side by '9'. x = 8.666666667 Simplifying x = 8.666666667
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