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Simplifying -3(-21) = x Multiply -3 * -21 63 = x Solving 63 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 63 + -1x = x + -1x Combine like terms: x + -1x = 0 63 + -1x = 0 Add '-63' to each side of the equation. 63 + -63 + -1x = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -1x = 0 + -63 -1x = 0 + -63 Combine like terms: 0 + -63 = -63 -1x = -63 Divide each side by '-1'. x = 63 Simplifying x = 63
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