51=91-0.8x

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Solution for 51=91-0.8x equation: 



51=91-0.8x

We move all terms to the left:

51-(91-0.8x)=0

We add all the numbers together, and all the variables

-(-0.8x+91)+51=0

We get rid of parentheses

0.8x-91+51=0

We add all the numbers together, and all the variables

0.8x-40=0

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

0.8x=40

x=40/0.8

x=50

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