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Simplifying 10x + 21 = 15 + -2r Reorder the terms: 21 + 10x = 15 + -2r Solving 21 + 10x = 15 + -2r Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 10x = 15 + -21 + -2r Combine like terms: 21 + -21 = 0 0 + 10x = 15 + -21 + -2r 10x = 15 + -21 + -2r Combine like terms: 15 + -21 = -6 10x = -6 + -2r Divide each side by '10'. x = -0.6 + -0.2r Simplifying x = -0.6 + -0.2r
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