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Simplifying 1 + 7x = -21 + x Solving 1 + 7x = -21 + 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. 1 + 7x + -1x = -21 + x + -1x Combine like terms: 7x + -1x = 6x 1 + 6x = -21 + x + -1x Combine like terms: x + -1x = 0 1 + 6x = -21 + 0 1 + 6x = -21 Add '-1' to each side of the equation. 1 + -1 + 6x = -21 + -1 Combine like terms: 1 + -1 = 0 0 + 6x = -21 + -1 6x = -21 + -1 Combine like terms: -21 + -1 = -22 6x = -22 Divide each side by '6'. x = -3.666666667 Simplifying x = -3.666666667
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