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Simplifying (3x + 72) + (15x + -18) = 90 Reorder the terms: (72 + 3x) + (15x + -18) = 90 Remove parenthesis around (72 + 3x) 72 + 3x + (15x + -18) = 90 Reorder the terms: 72 + 3x + (-18 + 15x) = 90 Remove parenthesis around (-18 + 15x) 72 + 3x + -18 + 15x = 90 Reorder the terms: 72 + -18 + 3x + 15x = 90 Combine like terms: 72 + -18 = 54 54 + 3x + 15x = 90 Combine like terms: 3x + 15x = 18x 54 + 18x = 90 Solving 54 + 18x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-54' to each side of the equation. 54 + -54 + 18x = 90 + -54 Combine like terms: 54 + -54 = 0 0 + 18x = 90 + -54 18x = 90 + -54 Combine like terms: 90 + -54 = 36 18x = 36 Divide each side by '18'. x = 2 Simplifying x = 2
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