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Simplifying 3(4 + -1x) + 9 = x + -7 (4 * 3 + -1x * 3) + 9 = x + -7 (12 + -3x) + 9 = x + -7 Reorder the terms: 12 + 9 + -3x = x + -7 Combine like terms: 12 + 9 = 21 21 + -3x = x + -7 Reorder the terms: 21 + -3x = -7 + x Solving 21 + -3x = -7 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 21 + -3x + -1x = -7 + x + -1x Combine like terms: -3x + -1x = -4x 21 + -4x = -7 + x + -1x Combine like terms: x + -1x = 0 21 + -4x = -7 + 0 21 + -4x = -7 Add '-21' to each side of the equation. 21 + -21 + -4x = -7 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = -7 + -21 -4x = -7 + -21 Combine like terms: -7 + -21 = -28 -4x = -28 Divide each side by '-4'. x = 7 Simplifying x = 7
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