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Simplifying 21 = -3(21 + -1x) + 3(x + -4) 21 = (21 * -3 + -1x * -3) + 3(x + -4) 21 = (-63 + 3x) + 3(x + -4) Reorder the terms: 21 = -63 + 3x + 3(-4 + x) 21 = -63 + 3x + (-4 * 3 + x * 3) 21 = -63 + 3x + (-12 + 3x) Reorder the terms: 21 = -63 + -12 + 3x + 3x Combine like terms: -63 + -12 = -75 21 = -75 + 3x + 3x Combine like terms: 3x + 3x = 6x 21 = -75 + 6x Solving 21 = -75 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21 + -6x = -75 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -6x = -75 + 0 21 + -6x = -75 Add '-21' to each side of the equation. 21 + -21 + -6x = -75 + -21 Combine like terms: 21 + -21 = 0 0 + -6x = -75 + -21 -6x = -75 + -21 Combine like terms: -75 + -21 = -96 -6x = -96 Divide each side by '-6'. x = 16 Simplifying x = 16
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