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Simplifying -21 = 3(-6x + -3) Reorder the terms: -21 = 3(-3 + -6x) -21 = (-3 * 3 + -6x * 3) -21 = (-9 + -18x) Solving -21 = -9 + -18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18x' to each side of the equation. -21 + 18x = -9 + -18x + 18x Combine like terms: -18x + 18x = 0 -21 + 18x = -9 + 0 -21 + 18x = -9 Add '21' to each side of the equation. -21 + 21 + 18x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + 18x = -9 + 21 18x = -9 + 21 Combine like terms: -9 + 21 = 12 18x = 12 Divide each side by '18'. x = 0.6666666667 Simplifying x = 0.6666666667
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