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Simplifying -15 + -2r = -5(3 + -2r) -15 + -2r = (3 * -5 + -2r * -5) -15 + -2r = (-15 + 10r) Add '15' to each side of the equation. -15 + 15 + -2r = -15 + 15 + 10r Combine like terms: -15 + 15 = 0 0 + -2r = -15 + 15 + 10r -2r = -15 + 15 + 10r Combine like terms: -15 + 15 = 0 -2r = 0 + 10r -2r = 10r Solving -2r = 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -2r + -10r = 10r + -10r Combine like terms: -2r + -10r = -12r -12r = 10r + -10r Combine like terms: 10r + -10r = 0 -12r = 0 Divide each side by '-12'. r = 0 Simplifying r = 0
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