b*10+b*4=7

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Solution for b*10+b*4=7 equation: 



b*10+b*4=7

We move all terms to the left:

b*10+b*4-(7)=0

Wy multiply elements

10b+4b-7=0

We add all the numbers together, and all the variables

14b-7=0

We move all terms containing b to the left, all other terms to the right

14b=7

b=7/14

b=1/2

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