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Simplifying 4x + -1(7x + -1) = 13 Reorder the terms: 4x + -1(-1 + 7x) = 13 4x + (-1 * -1 + 7x * -1) = 13 4x + (1 + -7x) = 13 Reorder the terms: 1 + 4x + -7x = 13 Combine like terms: 4x + -7x = -3x 1 + -3x = 13 Solving 1 + -3x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -3x = 13 + -1 Combine like terms: 1 + -1 = 0 0 + -3x = 13 + -1 -3x = 13 + -1 Combine like terms: 13 + -1 = 12 -3x = 12 Divide each side by '-3'. x = -4 Simplifying x = -4
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