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Simplifying -80 = -2x + -4(-5x + -7) Reorder the terms: -80 = -2x + -4(-7 + -5x) -80 = -2x + (-7 * -4 + -5x * -4) -80 = -2x + (28 + 20x) Reorder the terms: -80 = 28 + -2x + 20x Combine like terms: -2x + 20x = 18x -80 = 28 + 18x Solving -80 = 28 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. -80 + -18x = 28 + 18x + -18x Combine like terms: 18x + -18x = 0 -80 + -18x = 28 + 0 -80 + -18x = 28 Add '80' to each side of the equation. -80 + 80 + -18x = 28 + 80 Combine like terms: -80 + 80 = 0 0 + -18x = 28 + 80 -18x = 28 + 80 Combine like terms: 28 + 80 = 108 -18x = 108 Divide each side by '-18'. x = -6 Simplifying x = -6
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