40=90-10x

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Solution for 40=90-10x equation: 



40=90-10x

We move all terms to the left:

40-(90-10x)=0

We add all the numbers together, and all the variables

-(-10x+90)+40=0

We get rid of parentheses

10x-90+40=0

We add all the numbers together, and all the variables

10x-50=0

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

10x=50

x=50/10

x=5

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