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Simplifying -9 = 3x + 3(x + -7) Reorder the terms: -9 = 3x + 3(-7 + x) -9 = 3x + (-7 * 3 + x * 3) -9 = 3x + (-21 + 3x) Reorder the terms: -9 = -21 + 3x + 3x Combine like terms: 3x + 3x = 6x -9 = -21 + 6x Solving -9 = -21 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -9 + -6x = -21 + 6x + -6x Combine like terms: 6x + -6x = 0 -9 + -6x = -21 + 0 -9 + -6x = -21 Add '9' to each side of the equation. -9 + 9 + -6x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -6x = -21 + 9 -6x = -21 + 9 Combine like terms: -21 + 9 = -12 -6x = -12 Divide each side by '-6'. x = 2 Simplifying x = 2
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