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Simplifying 3(3x + -4) = 3x + 21 Reorder the terms: 3(-4 + 3x) = 3x + 21 (-4 * 3 + 3x * 3) = 3x + 21 (-12 + 9x) = 3x + 21 Reorder the terms: -12 + 9x = 21 + 3x Solving -12 + 9x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -12 + 9x + -3x = 21 + 3x + -3x Combine like terms: 9x + -3x = 6x -12 + 6x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 -12 + 6x = 21 + 0 -12 + 6x = 21 Add '12' to each side of the equation. -12 + 12 + 6x = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 6x = 21 + 12 6x = 21 + 12 Combine like terms: 21 + 12 = 33 6x = 33 Divide each side by '6'. x = 5.5 Simplifying x = 5.5
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