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Simplifying 13x + -1(9x + -7) = 27 Reorder the terms: 13x + -1(-7 + 9x) = 27 13x + (-7 * -1 + 9x * -1) = 27 13x + (7 + -9x) = 27 Reorder the terms: 7 + 13x + -9x = 27 Combine like terms: 13x + -9x = 4x 7 + 4x = 27 Solving 7 + 4x = 27 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4x = 27 + -7 Combine like terms: 7 + -7 = 0 0 + 4x = 27 + -7 4x = 27 + -7 Combine like terms: 27 + -7 = 20 4x = 20 Divide each side by '4'. x = 5 Simplifying x = 5
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