9x+40=7x-100

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Solution for 9x+40=7x-100 equation: 



9x+40=7x-100

We move all terms to the left:

9x+40-(7x-100)=0

We get rid of parentheses

9x-7x+100+40=0

We add all the numbers together, and all the variables

2x+140=0

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

2x=-140

x=-140/2

x=-70

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