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Simplifying 12(4r + -5r) = 19r + -15 + 135r Combine like terms: 4r + -5r = -1r 12(-1r) = 19r + -15 + 135r Remove parenthesis around (-1r) 12 * -1r = 19r + -15 + 135r Multiply 12 * -1 -12r = 19r + -15 + 135r Reorder the terms: -12r = -15 + 19r + 135r Combine like terms: 19r + 135r = 154r -12r = -15 + 154r Solving -12r = -15 + 154r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-154r' to each side of the equation. -12r + -154r = -15 + 154r + -154r Combine like terms: -12r + -154r = -166r -166r = -15 + 154r + -154r Combine like terms: 154r + -154r = 0 -166r = -15 + 0 -166r = -15 Divide each side by '-166'. r = 0.09036144578 Simplifying r = 0.09036144578
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