(100-10x)+(2-7x)=(90-20x)

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Solution for (100-10x)+(2-7x)=(90-20x) equation: 



(100-10x)+(2-7x)=(90-20x)

We move all terms to the left:

(100-10x)+(2-7x)-((90-20x))=0

We add all the numbers together, and all the variables

(-10x+100)+(-7x+2)-((-20x+90))=0

We get rid of parentheses

-10x-7x-((-20x+90))+100+2=0



We calculate terms in parentheses: -((-20x+90)), so:

(-20x+90)

We get rid of parentheses

-20x+90

Back to the equation:

-(-20x+90)



We add all the numbers together, and all the variables

-17x-(-20x+90)+102=0

We get rid of parentheses

-17x+20x-90+102=0

We add all the numbers together, and all the variables

3x+12=0

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

3x=-12

x=-12/3

x=-4

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