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Simplifying 5x + -2(-1x + -7) = 21 Reorder the terms: 5x + -2(-7 + -1x) = 21 5x + (-7 * -2 + -1x * -2) = 21 5x + (14 + 2x) = 21 Reorder the terms: 14 + 5x + 2x = 21 Combine like terms: 5x + 2x = 7x 14 + 7x = 21 Solving 14 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 7x = 21 + -14 Combine like terms: 14 + -14 = 0 0 + 7x = 21 + -14 7x = 21 + -14 Combine like terms: 21 + -14 = 7 7x = 7 Divide each side by '7'. x = 1 Simplifying x = 1
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