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Simplifying 7x + 5 + x + -2 = 4x + 21 Reorder the terms: 5 + -2 + 7x + x = 4x + 21 Combine like terms: 5 + -2 = 3 3 + 7x + x = 4x + 21 Combine like terms: 7x + x = 8x 3 + 8x = 4x + 21 Reorder the terms: 3 + 8x = 21 + 4x Solving 3 + 8x = 21 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 3 + 8x + -4x = 21 + 4x + -4x Combine like terms: 8x + -4x = 4x 3 + 4x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 3 + 4x = 21 + 0 3 + 4x = 21 Add '-3' to each side of the equation. 3 + -3 + 4x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 21 + -3 4x = 21 + -3 Combine like terms: 21 + -3 = 18 4x = 18 Divide each side by '4'. x = 4.5 Simplifying x = 4.5
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