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