(100-40x)+30x=90

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Solution for (100-40x)+30x=90 equation: 



(100-40x)+30x=90

We move all terms to the left:

(100-40x)+30x-(90)=0

We add all the numbers together, and all the variables

(-40x+100)+30x-90=0

We add all the numbers together, and all the variables

30x+(-40x+100)-90=0

We get rid of parentheses

30x-40x+100-90=0

We add all the numbers together, and all the variables

-10x+10=0

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

-10x=-10

x=-10/-10

x=1

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