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Simplifying 21x + -13 = 10x + 31 Reorder the terms: -13 + 21x = 10x + 31 Reorder the terms: -13 + 21x = 31 + 10x Solving -13 + 21x = 31 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. -13 + 21x + -10x = 31 + 10x + -10x Combine like terms: 21x + -10x = 11x -13 + 11x = 31 + 10x + -10x Combine like terms: 10x + -10x = 0 -13 + 11x = 31 + 0 -13 + 11x = 31 Add '13' to each side of the equation. -13 + 13 + 11x = 31 + 13 Combine like terms: -13 + 13 = 0 0 + 11x = 31 + 13 11x = 31 + 13 Combine like terms: 31 + 13 = 44 11x = 44 Divide each side by '11'. x = 4 Simplifying x = 4
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