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(120-11b)/7*4=9b+12
We move all terms to the left:
(120-11b)/7*4-(9b+12)=0
We add all the numbers together, and all the variables
(-11b+120)/7*4-(9b+12)=0
We get rid of parentheses
(-11b+120)/7*4-9b-12=0
We multiply all the terms by the denominator
(-11b+120)-9b*7*4-12*7*4=0
We add all the numbers together, and all the variables
(-11b+120)-9b*7*4-336=0
Wy multiply elements
(-11b+120)-252b*4-336=0
We get rid of parentheses
-11b-252b*4+120-336=0
We add all the numbers together, and all the variables
-11b-252b*4-216=0
Wy multiply elements
-11b-1008b-216=0
We add all the numbers together, and all the variables
-1019b-216=0
We move all terms containing b to the left, all other terms to the right
-1019b=216
b=216/-1019
b=-216/1019
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