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Simplifying 13x + -1(4x + -9) = 90 Reorder the terms: 13x + -1(-9 + 4x) = 90 13x + (-9 * -1 + 4x * -1) = 90 13x + (9 + -4x) = 90 Reorder the terms: 9 + 13x + -4x = 90 Combine like terms: 13x + -4x = 9x 9 + 9x = 90 Solving 9 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 9x = 90 + -9 Combine like terms: 9 + -9 = 0 0 + 9x = 90 + -9 9x = 90 + -9 Combine like terms: 90 + -9 = 81 9x = 81 Divide each side by '9'. x = 9 Simplifying x = 9
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