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Simplifying 2x + 7 = 7x + 21 Reorder the terms: 7 + 2x = 7x + 21 Reorder the terms: 7 + 2x = 21 + 7x Solving 7 + 2x = 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 + 2x + -7x = 21 + 7x + -7x Combine like terms: 2x + -7x = -5x 7 + -5x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 7 + -5x = 21 + 0 7 + -5x = 21 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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