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Simplifying -135 = -3(7x + -4) Reorder the terms: -135 = -3(-4 + 7x) -135 = (-4 * -3 + 7x * -3) -135 = (12 + -21x) Solving -135 = 12 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. -135 + 21x = 12 + -21x + 21x Combine like terms: -21x + 21x = 0 -135 + 21x = 12 + 0 -135 + 21x = 12 Add '135' to each side of the equation. -135 + 135 + 21x = 12 + 135 Combine like terms: -135 + 135 = 0 0 + 21x = 12 + 135 21x = 12 + 135 Combine like terms: 12 + 135 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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