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Simplifying 3 + 4(2x + -3) + -5x = 21 Reorder the terms: 3 + 4(-3 + 2x) + -5x = 21 3 + (-3 * 4 + 2x * 4) + -5x = 21 3 + (-12 + 8x) + -5x = 21 Combine like terms: 3 + -12 = -9 -9 + 8x + -5x = 21 Combine like terms: 8x + -5x = 3x -9 + 3x = 21 Solving -9 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 3x = 21 + 9 3x = 21 + 9 Combine like terms: 21 + 9 = 30 3x = 30 Divide each side by '3'. x = 10 Simplifying x = 10
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