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Simplifying -7.8 = 4.5 + 2r Solving -7.8 = 4.5 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -7.8 + -2r = 4.5 + 2r + -2r Combine like terms: 2r + -2r = 0 -7.8 + -2r = 4.5 + 0 -7.8 + -2r = 4.5 Add '7.8' to each side of the equation. -7.8 + 7.8 + -2r = 4.5 + 7.8 Combine like terms: -7.8 + 7.8 = 0.0 0.0 + -2r = 4.5 + 7.8 -2r = 4.5 + 7.8 Combine like terms: 4.5 + 7.8 = 12.3 -2r = 12.3 Divide each side by '-2'. r = -6.15 Simplifying r = -6.15
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