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40*2+b*2=50*2
We move all terms to the left:
40*2+b*2-(50*2)=0
We add all the numbers together, and all the variables
b*2+40*2-100=0
We add all the numbers together, and all the variables
b*2-20=0
Wy multiply elements
2b-20=0
We move all terms containing b to the left, all other terms to the right
2b=20
b=20/2
b=10
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