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Simplifying 140 = -7(1 + 3x) 140 = (1 * -7 + 3x * -7) 140 = (-7 + -21x) Solving 140 = -7 + -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. 140 + 21x = -7 + -21x + 21x Combine like terms: -21x + 21x = 0 140 + 21x = -7 + 0 140 + 21x = -7 Add '-140' to each side of the equation. 140 + -140 + 21x = -7 + -140 Combine like terms: 140 + -140 = 0 0 + 21x = -7 + -140 21x = -7 + -140 Combine like terms: -7 + -140 = -147 21x = -147 Divide each side by '21'. x = -7 Simplifying x = -7
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