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Simplifying 7x + 5 + -2(x + -1) = 21 Reorder the terms: 7x + 5 + -2(-1 + x) = 21 7x + 5 + (-1 * -2 + x * -2) = 21 7x + 5 + (2 + -2x) = 21 Reorder the terms: 5 + 2 + 7x + -2x = 21 Combine like terms: 5 + 2 = 7 7 + 7x + -2x = 21 Combine like terms: 7x + -2x = 5x 7 + 5x = 21 Solving 7 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5x = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 5x = 21 + -7 5x = 21 + -7 Combine like terms: 21 + -7 = 14 5x = 14 Divide each side by '5'. x = 2.8 Simplifying x = 2.8
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