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Simplifying 7x = 59 + -1(13x + -21) Reorder the terms: 7x = 59 + -1(-21 + 13x) 7x = 59 + (-21 * -1 + 13x * -1) 7x = 59 + (21 + -13x) Combine like terms: 59 + 21 = 80 7x = 80 + -13x Solving 7x = 80 + -13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13x' to each side of the equation. 7x + 13x = 80 + -13x + 13x Combine like terms: 7x + 13x = 20x 20x = 80 + -13x + 13x Combine like terms: -13x + 13x = 0 20x = 80 + 0 20x = 80 Divide each side by '20'. x = 4 Simplifying x = 4
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