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Simplifying 13x + -1(4x + -7) = 43 Reorder the terms: 13x + -1(-7 + 4x) = 43 13x + (-7 * -1 + 4x * -1) = 43 13x + (7 + -4x) = 43 Reorder the terms: 7 + 13x + -4x = 43 Combine like terms: 13x + -4x = 9x 7 + 9x = 43 Solving 7 + 9x = 43 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 + 9x = 43 + -7 Combine like terms: 7 + -7 = 0 0 + 9x = 43 + -7 9x = 43 + -7 Combine like terms: 43 + -7 = 36 9x = 36 Divide each side by '9'. x = 4 Simplifying x = 4
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