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56*2+b*2=65*2
We move all terms to the left:
56*2+b*2-(65*2)=0
We add all the numbers together, and all the variables
b*2+56*2-130=0
We add all the numbers together, and all the variables
b*2-18=0
Wy multiply elements
2b-18=0
We move all terms containing b to the left, all other terms to the right
2b=18
b=18/2
b=9
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