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Simplifying 21 + -7x = 39 + -10x Solving 21 + -7x = 39 + -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. 21 + -7x + 10x = 39 + -10x + 10x Combine like terms: -7x + 10x = 3x 21 + 3x = 39 + -10x + 10x Combine like terms: -10x + 10x = 0 21 + 3x = 39 + 0 21 + 3x = 39 Add '-21' to each side of the equation. 21 + -21 + 3x = 39 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 39 + -21 3x = 39 + -21 Combine like terms: 39 + -21 = 18 3x = 18 Divide each side by '3'. x = 6 Simplifying x = 6
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