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Simplifying -79 = 5x + -3(-5x + -7) Reorder the terms: -79 = 5x + -3(-7 + -5x) -79 = 5x + (-7 * -3 + -5x * -3) -79 = 5x + (21 + 15x) Reorder the terms: -79 = 21 + 5x + 15x Combine like terms: 5x + 15x = 20x -79 = 21 + 20x Solving -79 = 21 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. -79 + -20x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 -79 + -20x = 21 + 0 -79 + -20x = 21 Add '79' to each side of the equation. -79 + 79 + -20x = 21 + 79 Combine like terms: -79 + 79 = 0 0 + -20x = 21 + 79 -20x = 21 + 79 Combine like terms: 21 + 79 = 100 -20x = 100 Divide each side by '-20'. x = -5 Simplifying x = -5
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