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Simplifying 5x + -7 = 21 + -2x Reorder the terms: -7 + 5x = 21 + -2x Solving -7 + 5x = 21 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -7 + 5x + 2x = 21 + -2x + 2x Combine like terms: 5x + 2x = 7x -7 + 7x = 21 + -2x + 2x Combine like terms: -2x + 2x = 0 -7 + 7x = 21 + 0 -7 + 7x = 21 Add '7' to each side of the equation. -7 + 7 + 7x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7x = 21 + 7 7x = 21 + 7 Combine like terms: 21 + 7 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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