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Simplifying 90 + 40 = r + 300 Combine like terms: 90 + 40 = 130 130 = r + 300 Reorder the terms: 130 = 300 + r Solving 130 = 300 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 130 + -1r = 300 + r + -1r Combine like terms: r + -1r = 0 130 + -1r = 300 + 0 130 + -1r = 300 Add '-130' to each side of the equation. 130 + -130 + -1r = 300 + -130 Combine like terms: 130 + -130 = 0 0 + -1r = 300 + -130 -1r = 300 + -130 Combine like terms: 300 + -130 = 170 -1r = 170 Divide each side by '-1'. r = -170 Simplifying r = -170
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