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Simplifying 9 * 2 + 21 * 2r = 3 * 2r + -2r Multiply 9 * 2 18 + 21 * 2r = 3 * 2r + -2r Multiply 21 * 2 18 + 42r = 3 * 2r + -2r Multiply 3 * 2 18 + 42r = 6r + -2r Combine like terms: 6r + -2r = 4r 18 + 42r = 4r Solving 18 + 42r = 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. 18 + 42r + -4r = 4r + -4r Combine like terms: 42r + -4r = 38r 18 + 38r = 4r + -4r Combine like terms: 4r + -4r = 0 18 + 38r = 0 Add '-18' to each side of the equation. 18 + -18 + 38r = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 38r = 0 + -18 38r = 0 + -18 Combine like terms: 0 + -18 = -18 38r = -18 Divide each side by '38'. r = -0.4736842105 Simplifying r = -0.4736842105
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