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Simplifying 70 = 50 + 50r * 10 Reorder the terms for easier multiplication: 70 = 50 + 50 * 10r Multiply 50 * 10 70 = 50 + 500r Solving 70 = 50 + 500r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-500r' to each side of the equation. 70 + -500r = 50 + 500r + -500r Combine like terms: 500r + -500r = 0 70 + -500r = 50 + 0 70 + -500r = 50 Add '-70' to each side of the equation. 70 + -70 + -500r = 50 + -70 Combine like terms: 70 + -70 = 0 0 + -500r = 50 + -70 -500r = 50 + -70 Combine like terms: 50 + -70 = -20 -500r = -20 Divide each side by '-500'. r = 0.04 Simplifying r = 0.04
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