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Simplifying 31 + -7x = 2x + 21 Reorder the terms: 31 + -7x = 21 + 2x Solving 31 + -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. 31 + -7x + -2x = 21 + 2x + -2x Combine like terms: -7x + -2x = -9x 31 + -9x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 31 + -9x = 21 + 0 31 + -9x = 21 Add '-31' to each side of the equation. 31 + -31 + -9x = 21 + -31 Combine like terms: 31 + -31 = 0 0 + -9x = 21 + -31 -9x = 21 + -31 Combine like terms: 21 + -31 = -10 -9x = -10 Divide each side by '-9'. x = 1.111111111 Simplifying x = 1.111111111
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