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Simplifying (15x + -2) + (7x + 4) = 90 Reorder the terms: (-2 + 15x) + (7x + 4) = 90 Remove parenthesis around (-2 + 15x) -2 + 15x + (7x + 4) = 90 Reorder the terms: -2 + 15x + (4 + 7x) = 90 Remove parenthesis around (4 + 7x) -2 + 15x + 4 + 7x = 90 Reorder the terms: -2 + 4 + 15x + 7x = 90 Combine like terms: -2 + 4 = 2 2 + 15x + 7x = 90 Combine like terms: 15x + 7x = 22x 2 + 22x = 90 Solving 2 + 22x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 22x = 90 + -2 Combine like terms: 2 + -2 = 0 0 + 22x = 90 + -2 22x = 90 + -2 Combine like terms: 90 + -2 = 88 22x = 88 Divide each side by '22'. x = 4 Simplifying x = 4
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