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Simplifying 3(21 + -1x) = 4x + -21 (21 * 3 + -1x * 3) = 4x + -21 (63 + -3x) = 4x + -21 Reorder the terms: 63 + -3x = -21 + 4x Solving 63 + -3x = -21 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 63 + -3x + -4x = -21 + 4x + -4x Combine like terms: -3x + -4x = -7x 63 + -7x = -21 + 4x + -4x Combine like terms: 4x + -4x = 0 63 + -7x = -21 + 0 63 + -7x = -21 Add '-63' to each side of the equation. 63 + -63 + -7x = -21 + -63 Combine like terms: 63 + -63 = 0 0 + -7x = -21 + -63 -7x = -21 + -63 Combine like terms: -21 + -63 = -84 -7x = -84 Divide each side by '-7'. x = 12 Simplifying x = 12
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