-3(5-7x)=90

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Solution for -3(5-7x)=90 equation: 



-3(5-7x)=90

We move all terms to the left:

-3(5-7x)-(90)=0

We add all the numbers together, and all the variables

-3(-7x+5)-90=0

We multiply parentheses

21x-15-90=0

We add all the numbers together, and all the variables

21x-105=0

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

21x=105

x=105/21

x=5

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