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Simplifying 2x + -3(-7x + 7) = 140 Reorder the terms: 2x + -3(7 + -7x) = 140 2x + (7 * -3 + -7x * -3) = 140 2x + (-21 + 21x) = 140 Reorder the terms: -21 + 2x + 21x = 140 Combine like terms: 2x + 21x = 23x -21 + 23x = 140 Solving -21 + 23x = 140 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 23x = 140 + 21 Combine like terms: -21 + 21 = 0 0 + 23x = 140 + 21 23x = 140 + 21 Combine like terms: 140 + 21 = 161 23x = 161 Divide each side by '23'. x = 7 Simplifying x = 7
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