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Simplifying -15 = 6x + -3(3x + -4) Reorder the terms: -15 = 6x + -3(-4 + 3x) -15 = 6x + (-4 * -3 + 3x * -3) -15 = 6x + (12 + -9x) Reorder the terms: -15 = 12 + 6x + -9x Combine like terms: 6x + -9x = -3x -15 = 12 + -3x Solving -15 = 12 + -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. -15 + 3x = 12 + -3x + 3x Combine like terms: -3x + 3x = 0 -15 + 3x = 12 + 0 -15 + 3x = 12 Add '15' to each side of the equation. -15 + 15 + 3x = 12 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 12 + 15 3x = 12 + 15 Combine like terms: 12 + 15 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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