7*(6-8,5x)=220,5

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Solution for 7*(6-8,5x)=220,5 equation: 



7(6-8.5x)=220.5

We move all terms to the left:

7(6-8.5x)-(220.5)=0

We add all the numbers together, and all the variables

7(-8.5x+6)-(220.5)=0

We add all the numbers together, and all the variables

7(-8.5x+6)-220.5=0

We multiply parentheses

-56x+42-220.5=0

We add all the numbers together, and all the variables

-56x-178.5=0

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

-56x=178.5

x=178.5/-56

x=-3+4.2/22.4

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