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Simplifying 5x + 1 + -7x = -21 Reorder the terms: 1 + 5x + -7x = -21 Combine like terms: 5x + -7x = -2x 1 + -2x = -21 Solving 1 + -2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2x = -21 + -1 Combine like terms: 1 + -1 = 0 0 + -2x = -21 + -1 -2x = -21 + -1 Combine like terms: -21 + -1 = -22 -2x = -22 Divide each side by '-2'. x = 11 Simplifying x = 11
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