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Simplifying 2x + -1(-1x + -7) = 21 Reorder the terms: 2x + -1(-7 + -1x) = 21 2x + (-7 * -1 + -1x * -1) = 21 2x + (7 + 1x) = 21 Reorder the terms: 7 + 2x + 1x = 21 Combine like terms: 2x + 1x = 3x 7 + 3x = 21 Solving 7 + 3x = 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 + 3x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 3x = 21 + -7 3x = 21 + -7 Combine like terms: 21 + -7 = 14 3x = 14 Divide each side by '3'. x = 4.666666667 Simplifying x = 4.666666667
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