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Simplifying -75 = -5x + -3(-4x + -3) Reorder the terms: -75 = -5x + -3(-3 + -4x) -75 = -5x + (-3 * -3 + -4x * -3) -75 = -5x + (9 + 12x) Reorder the terms: -75 = 9 + -5x + 12x Combine like terms: -5x + 12x = 7x -75 = 9 + 7x Solving -75 = 9 + 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. -75 + -7x = 9 + 7x + -7x Combine like terms: 7x + -7x = 0 -75 + -7x = 9 + 0 -75 + -7x = 9 Add '75' to each side of the equation. -75 + 75 + -7x = 9 + 75 Combine like terms: -75 + 75 = 0 0 + -7x = 9 + 75 -7x = 9 + 75 Combine like terms: 9 + 75 = 84 -7x = 84 Divide each side by '-7'. x = -12 Simplifying x = -12
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