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Simplifying 10 + -2r = -2(1 + -2r) 10 + -2r = (1 * -2 + -2r * -2) 10 + -2r = (-2 + 4r) Solving 10 + -2r = -2 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 10 + -2r + -4r = -2 + 4r + -4r Combine like terms: -2r + -4r = -6r 10 + -6r = -2 + 4r + -4r Combine like terms: 4r + -4r = 0 10 + -6r = -2 + 0 10 + -6r = -2 Add '-10' to each side of the equation. 10 + -10 + -6r = -2 + -10 Combine like terms: 10 + -10 = 0 0 + -6r = -2 + -10 -6r = -2 + -10 Combine like terms: -2 + -10 = -12 -6r = -12 Divide each side by '-6'. r = 2 Simplifying r = 2
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