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