70=0.7(200-x)

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Solution for 70=0.7(200-x) equation: 



70=0.7(200-x)

We move all terms to the left:

70-(0.7(200-x))=0

We add all the numbers together, and all the variables

-(0.7(-1x+200))+70=0



We calculate terms in parentheses: -(0.7(-1x+200)), so:

0.7(-1x+200)

We multiply parentheses

-0.7x+140

Back to the equation:

-(-0.7x+140)



We get rid of parentheses

0.7x-140+70=0

We add all the numbers together, and all the variables

0.7x-70=0

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

0.7x=70

x=70/0.7

x=100

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