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Simplifying -1(-7x) = -21 Remove parenthesis around (-7x) -1 * -7x = -21 Multiply -1 * -7 7x = -21 Solving 7x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '7'. x = -3 Simplifying x = -3
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