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Simplifying 12r + -18 = 13r * 18 Reorder the terms: -18 + 12r = 13r * 18 Reorder the terms for easier multiplication: -18 + 12r = 13 * 18r Multiply 13 * 18 -18 + 12r = 234r Solving -18 + 12r = 234r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-234r' to each side of the equation. -18 + 12r + -234r = 234r + -234r Combine like terms: 12r + -234r = -222r -18 + -222r = 234r + -234r Combine like terms: 234r + -234r = 0 -18 + -222r = 0 Add '18' to each side of the equation. -18 + 18 + -222r = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -222r = 0 + 18 -222r = 0 + 18 Combine like terms: 0 + 18 = 18 -222r = 18 Divide each side by '-222'. r = -0.08108108108 Simplifying r = -0.08108108108
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