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3.4(1-1.8r)-6r=76.12
We move all terms to the left:
3.4(1-1.8r)-6r-(76.12)=0
We add all the numbers together, and all the variables
3.4(-1.8r+1)-6r-(76.12)=0
We add all the numbers together, and all the variables
-6r+3.4(-1.8r+1)-76.12=0
We multiply parentheses
-6r-3.4r+3.4-76.12=0
We add all the numbers together, and all the variables
-9.4r-72.72=0
We move all terms containing r to the left, all other terms to the right
-9.4r=72.72
r=72.72/-9.4
r=-7+1.76530612245/2.39795918367
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