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Simplifying 4r + 12 = 16r + 9 Reorder the terms: 12 + 4r = 16r + 9 Reorder the terms: 12 + 4r = 9 + 16r Solving 12 + 4r = 9 + 16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16r' to each side of the equation. 12 + 4r + -16r = 9 + 16r + -16r Combine like terms: 4r + -16r = -12r 12 + -12r = 9 + 16r + -16r Combine like terms: 16r + -16r = 0 12 + -12r = 9 + 0 12 + -12r = 9 Add '-12' to each side of the equation. 12 + -12 + -12r = 9 + -12 Combine like terms: 12 + -12 = 0 0 + -12r = 9 + -12 -12r = 9 + -12 Combine like terms: 9 + -12 = -3 -12r = -3 Divide each side by '-12'. r = 0.25 Simplifying r = 0.25
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