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Simplifying 9x + -3 = -3(x + -7) Reorder the terms: -3 + 9x = -3(x + -7) Reorder the terms: -3 + 9x = -3(-7 + x) -3 + 9x = (-7 * -3 + x * -3) -3 + 9x = (21 + -3x) Solving -3 + 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. -3 + 9x + 3x = 21 + -3x + 3x Combine like terms: 9x + 3x = 12x -3 + 12x = 21 + -3x + 3x Combine like terms: -3x + 3x = 0 -3 + 12x = 21 + 0 -3 + 12x = 21 Add '3' to each side of the equation. -3 + 3 + 12x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 12x = 21 + 3 12x = 21 + 3 Combine like terms: 21 + 3 = 24 12x = 24 Divide each side by '12'. x = 2 Simplifying x = 2
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