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Simplifying -1(x + -7) + 13 = -7x + 4 Reorder the terms: -1(-7 + x) + 13 = -7x + 4 (-7 * -1 + x * -1) + 13 = -7x + 4 (7 + -1x) + 13 = -7x + 4 Reorder the terms: 7 + 13 + -1x = -7x + 4 Combine like terms: 7 + 13 = 20 20 + -1x = -7x + 4 Reorder the terms: 20 + -1x = 4 + -7x Solving 20 + -1x = 4 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 20 + -1x + 7x = 4 + -7x + 7x Combine like terms: -1x + 7x = 6x 20 + 6x = 4 + -7x + 7x Combine like terms: -7x + 7x = 0 20 + 6x = 4 + 0 20 + 6x = 4 Add '-20' to each side of the equation. 20 + -20 + 6x = 4 + -20 Combine like terms: 20 + -20 = 0 0 + 6x = 4 + -20 6x = 4 + -20 Combine like terms: 4 + -20 = -16 6x = -16 Divide each side by '6'. x = -2.666666667 Simplifying x = -2.666666667
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