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Simplifying 4r + 7 + -8r = 19 Reorder the terms: 7 + 4r + -8r = 19 Combine like terms: 4r + -8r = -4r 7 + -4r = 19 Solving 7 + -4r = 19 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -4r = 19 + -7 Combine like terms: 7 + -7 = 0 0 + -4r = 19 + -7 -4r = 19 + -7 Combine like terms: 19 + -7 = 12 -4r = 12 Divide each side by '-4'. r = -3 Simplifying r = -3
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