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Simplifying 7x + 9 = 3(x + -7) Reorder the terms: 9 + 7x = 3(x + -7) Reorder the terms: 9 + 7x = 3(-7 + x) 9 + 7x = (-7 * 3 + x * 3) 9 + 7x = (-21 + 3x) Solving 9 + 7x = -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. 9 + 7x + -3x = -21 + 3x + -3x Combine like terms: 7x + -3x = 4x 9 + 4x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 9 + 4x = -21 + 0 9 + 4x = -21 Add '-9' to each side of the equation. 9 + -9 + 4x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 4x = -21 + -9 4x = -21 + -9 Combine like terms: -21 + -9 = -30 4x = -30 Divide each side by '4'. x = -7.5 Simplifying x = -7.5
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