75+x=4x-45

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Solution for 75+x=4x-45 equation: 



75+x=4x-45

We move all terms to the left:

75+x-(4x-45)=0

We get rid of parentheses

x-4x+45+75=0

We add all the numbers together, and all the variables

-3x+120=0

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

-3x=-120

x=-120/-3

x=+40

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