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Simplifying 64 + -7x = 2x + 21 Reorder the terms: 64 + -7x = 21 + 2x Solving 64 + -7x = 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. 64 + -7x + -2x = 21 + 2x + -2x Combine like terms: -7x + -2x = -9x 64 + -9x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 64 + -9x = 21 + 0 64 + -9x = 21 Add '-64' to each side of the equation. 64 + -64 + -9x = 21 + -64 Combine like terms: 64 + -64 = 0 0 + -9x = 21 + -64 -9x = 21 + -64 Combine like terms: 21 + -64 = -43 -9x = -43 Divide each side by '-9'. x = 4.777777778 Simplifying x = 4.777777778
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