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Simplifying -3(-7x + 1) = 144 Reorder the terms: -3(1 + -7x) = 144 (1 * -3 + -7x * -3) = 144 (-3 + 21x) = 144 Solving -3 + 21x = 144 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 21x = 144 + 3 Combine like terms: -3 + 3 = 0 0 + 21x = 144 + 3 21x = 144 + 3 Combine like terms: 144 + 3 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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