(x-20)+x=70

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Solution for (x-20)+x=70 equation: 



(x-20)+x=70

We move all terms to the left:

(x-20)+x-(70)=0

We add all the numbers together, and all the variables

x+(x-20)-70=0

We get rid of parentheses

x+x-20-70=0

We add all the numbers together, and all the variables

2x-90=0

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

2x=90

x=90/2

x=45

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