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Simplifying 3(x + -4) + -21x = 72 Reorder the terms: 3(-4 + x) + -21x = 72 (-4 * 3 + x * 3) + -21x = 72 (-12 + 3x) + -21x = 72 Combine like terms: 3x + -21x = -18x -12 + -18x = 72 Solving -12 + -18x = 72 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -18x = 72 + 12 Combine like terms: -12 + 12 = 0 0 + -18x = 72 + 12 -18x = 72 + 12 Combine like terms: 72 + 12 = 84 -18x = 84 Divide each side by '-18'. x = -4.666666667 Simplifying x = -4.666666667
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