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Simplifying 5(x + -1) + 7 = 21 Reorder the terms: 5(-1 + x) + 7 = 21 (-1 * 5 + x * 5) + 7 = 21 (-5 + 5x) + 7 = 21 Reorder the terms: -5 + 7 + 5x = 21 Combine like terms: -5 + 7 = 2 2 + 5x = 21 Solving 2 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 5x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + 5x = 21 + -2 5x = 21 + -2 Combine like terms: 21 + -2 = 19 5x = 19 Divide each side by '5'. x = 3.8 Simplifying x = 3.8
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