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Simplifying (8x + 1) + (5x + -2) = 90 Reorder the terms: (1 + 8x) + (5x + -2) = 90 Remove parenthesis around (1 + 8x) 1 + 8x + (5x + -2) = 90 Reorder the terms: 1 + 8x + (-2 + 5x) = 90 Remove parenthesis around (-2 + 5x) 1 + 8x + -2 + 5x = 90 Reorder the terms: 1 + -2 + 8x + 5x = 90 Combine like terms: 1 + -2 = -1 -1 + 8x + 5x = 90 Combine like terms: 8x + 5x = 13x -1 + 13x = 90 Solving -1 + 13x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 13x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 13x = 90 + 1 13x = 90 + 1 Combine like terms: 90 + 1 = 91 13x = 91 Divide each side by '13'. x = 7 Simplifying x = 7
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