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Simplifying 4 + -3(x + -3) = 21 Reorder the terms: 4 + -3(-3 + x) = 21 4 + (-3 * -3 + x * -3) = 21 4 + (9 + -3x) = 21 Combine like terms: 4 + 9 = 13 13 + -3x = 21 Solving 13 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -3x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + -3x = 21 + -13 -3x = 21 + -13 Combine like terms: 21 + -13 = 8 -3x = 8 Divide each side by '-3'. x = -2.666666667 Simplifying x = -2.666666667
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