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Simplifying 7 + -1x = 3(x + 7) Reorder the terms: 7 + -1x = 3(7 + x) 7 + -1x = (7 * 3 + x * 3) 7 + -1x = (21 + 3x) Solving 7 + -1x = 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. 7 + -1x + -3x = 21 + 3x + -3x Combine like terms: -1x + -3x = -4x 7 + -4x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 7 + -4x = 21 + 0 7 + -4x = 21 Add '-7' to each side of the equation. 7 + -7 + -4x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -4x = 21 + -7 -4x = 21 + -7 Combine like terms: 21 + -7 = 14 -4x = 14 Divide each side by '-4'. x = -3.5 Simplifying x = -3.5
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