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Simplifying 51 + -7x = 2x + 21 Reorder the terms: 51 + -7x = 21 + 2x Solving 51 + -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. 51 + -7x + -2x = 21 + 2x + -2x Combine like terms: -7x + -2x = -9x 51 + -9x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 51 + -9x = 21 + 0 51 + -9x = 21 Add '-51' to each side of the equation. 51 + -51 + -9x = 21 + -51 Combine like terms: 51 + -51 = 0 0 + -9x = 21 + -51 -9x = 21 + -51 Combine like terms: 21 + -51 = -30 -9x = -30 Divide each side by '-9'. x = 3.333333333 Simplifying x = 3.333333333
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