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Simplifying 10x + -21 = 7x Reorder the terms: -21 + 10x = 7x Solving -21 + 10x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -21 + 10x + -7x = 7x + -7x Combine like terms: 10x + -7x = 3x -21 + 3x = 7x + -7x Combine like terms: 7x + -7x = 0 -21 + 3x = 0 Add '21' to each side of the equation. -21 + 21 + 3x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 0 + 21 3x = 0 + 21 Combine like terms: 0 + 21 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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