4.2=0.042(70+a)

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Solution for 4.2=0.042(70+a) equation: 



4.2=0.042(70+a)

We move all terms to the left:

4.2-(0.042(70+a))=0

We add all the numbers together, and all the variables

-(0.042(a+70))+4.2=0



We calculate terms in parentheses: -(0.042(a+70)), so:

0.042(a+70)

We multiply parentheses

0.042a+2.94

Back to the equation:

-(0.042a+2.94)



We get rid of parentheses

-0.042a-2.94+4.2=0

We add all the numbers together, and all the variables

-0.042a+1.26=0

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

-0.042a=-1.26

a=-1.26/-0.042

a=+30

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