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Simplifying 13x + 8(5x + -9) = 21 Reorder the terms: 13x + 8(-9 + 5x) = 21 13x + (-9 * 8 + 5x * 8) = 21 13x + (-72 + 40x) = 21 Reorder the terms: -72 + 13x + 40x = 21 Combine like terms: 13x + 40x = 53x -72 + 53x = 21 Solving -72 + 53x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '72' to each side of the equation. -72 + 72 + 53x = 21 + 72 Combine like terms: -72 + 72 = 0 0 + 53x = 21 + 72 53x = 21 + 72 Combine like terms: 21 + 72 = 93 53x = 93 Divide each side by '53'. x = 1.754716981 Simplifying x = 1.754716981
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