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Simplifying 0.25(7 + 3r) = -0.2r (7 * 0.25 + 3r * 0.25) = -0.2r (1.75 + 0.75r) = -0.2r Solving 1.75 + 0.75r = -0.2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.2r' to each side of the equation. 1.75 + 0.75r + 0.2r = -0.2r + 0.2r Combine like terms: 0.75r + 0.2r = 0.95r 1.75 + 0.95r = -0.2r + 0.2r Combine like terms: -0.2r + 0.2r = 0.0 1.75 + 0.95r = 0.0 Add '-1.75' to each side of the equation. 1.75 + -1.75 + 0.95r = 0.0 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + 0.95r = 0.0 + -1.75 0.95r = 0.0 + -1.75 Combine like terms: 0.0 + -1.75 = -1.75 0.95r = -1.75 Divide each side by '0.95'. r = -1.842105263 Simplifying r = -1.842105263
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