169=8(2-5b)-7

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Solution for 169=8(2-5b)-7 equation: 



169=8(2-5b)-7

We move all terms to the left:

169-(8(2-5b)-7)=0

We add all the numbers together, and all the variables

-(8(-5b+2)-7)+169=0



We calculate terms in parentheses: -(8(-5b+2)-7), so:

8(-5b+2)-7

We multiply parentheses

-40b+16-7

We add all the numbers together, and all the variables

-40b+9

Back to the equation:

-(-40b+9)



We get rid of parentheses

40b-9+169=0

We add all the numbers together, and all the variables

40b+160=0

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

40b=-160

b=-160/40

b=-4

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