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Simplifying 9 = 7x + 3(x + -7) Reorder the terms: 9 = 7x + 3(-7 + x) 9 = 7x + (-7 * 3 + x * 3) 9 = 7x + (-21 + 3x) Reorder the terms: 9 = -21 + 7x + 3x Combine like terms: 7x + 3x = 10x 9 = -21 + 10x Solving 9 = -21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 9 + -10x = -21 + 10x + -10x Combine like terms: 10x + -10x = 0 9 + -10x = -21 + 0 9 + -10x = -21 Add '-9' to each side of the equation. 9 + -9 + -10x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -10x = -21 + -9 -10x = -21 + -9 Combine like terms: -21 + -9 = -30 -10x = -30 Divide each side by '-10'. x = 3 Simplifying x = 3
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