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Simplifying -3(4 + x) + 7(-3x) = 72 (4 * -3 + x * -3) + 7(-3x) = 72 (-12 + -3x) + 7(-3x) = 72 Remove parenthesis around (-3x) -12 + -3x + 7 * -3x = 72 Multiply 7 * -3 -12 + -3x + -21x = 72 Combine like terms: -3x + -21x = -24x -12 + -24x = 72 Solving -12 + -24x = 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 + -24x = 72 + 12 Combine like terms: -12 + 12 = 0 0 + -24x = 72 + 12 -24x = 72 + 12 Combine like terms: 72 + 12 = 84 -24x = 84 Divide each side by '-24'. x = -3.5 Simplifying x = -3.5
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