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Simplifying 9x + 4(x + -3) = 72 Reorder the terms: 9x + 4(-3 + x) = 72 9x + (-3 * 4 + x * 4) = 72 9x + (-12 + 4x) = 72 Reorder the terms: -12 + 9x + 4x = 72 Combine like terms: 9x + 4x = 13x -12 + 13x = 72 Solving -12 + 13x = 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 + 13x = 72 + 12 Combine like terms: -12 + 12 = 0 0 + 13x = 72 + 12 13x = 72 + 12 Combine like terms: 72 + 12 = 84 13x = 84 Divide each side by '13'. x = 6.461538462 Simplifying x = 6.461538462
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