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Simplifying 3x + -7(x + -1) = 21 Reorder the terms: 3x + -7(-1 + x) = 21 3x + (-1 * -7 + x * -7) = 21 3x + (7 + -7x) = 21 Reorder the terms: 7 + 3x + -7x = 21 Combine like terms: 3x + -7x = -4x 7 + -4x = 21 Solving 7 + -4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -4x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -4x = 21 + -7 -4x = 21 + -7 Combine like terms: 21 + -7 = 14 -4x = 14 Divide each side by '-4'. x = -3.5 Simplifying x = -3.5
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