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Simplifying 7(x + 3) = (x + -1) Reorder the terms: 7(3 + x) = (x + -1) (3 * 7 + x * 7) = (x + -1) (21 + 7x) = (x + -1) Reorder the terms: 21 + 7x = (-1 + x) Remove parenthesis around (-1 + x) 21 + 7x = -1 + x Solving 21 + 7x = -1 + 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 + 7x + -1x = -1 + x + -1x Combine like terms: 7x + -1x = 6x 21 + 6x = -1 + x + -1x Combine like terms: x + -1x = 0 21 + 6x = -1 + 0 21 + 6x = -1 Add '-21' to each side of the equation. 21 + -21 + 6x = -1 + -21 Combine like terms: 21 + -21 = 0 0 + 6x = -1 + -21 6x = -1 + -21 Combine like terms: -1 + -21 = -22 6x = -22 Divide each side by '6'. x = -3.666666667 Simplifying x = -3.666666667
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