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8(1-5r)=-312
We move all terms to the left:
8(1-5r)-(-312)=0
We add all the numbers together, and all the variables
8(-5r+1)-(-312)=0
We add all the numbers together, and all the variables
8(-5r+1)+312=0
We multiply parentheses
-40r+8+312=0
We add all the numbers together, and all the variables
-40r+320=0
We move all terms containing r to the left, all other terms to the right
-40r=-320
r=-320/-40
r=+8
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