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Simplifying 7x + -1(4x + -13) = 40 Reorder the terms: 7x + -1(-13 + 4x) = 40 7x + (-13 * -1 + 4x * -1) = 40 7x + (13 + -4x) = 40 Reorder the terms: 13 + 7x + -4x = 40 Combine like terms: 7x + -4x = 3x 13 + 3x = 40 Solving 13 + 3x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 3x = 40 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = 40 + -13 3x = 40 + -13 Combine like terms: 40 + -13 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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