(42+18)=(21+2y)

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Solution for (42+18)=(21+2y) equation: 



(42+18)=(21+2y)

We move all terms to the left:

(42+18)-((21+2y))=0

We add all the numbers together, and all the variables

-((2y+21))+60=0



We calculate terms in parentheses: -((2y+21)), so:

(2y+21)

We get rid of parentheses

2y+21

Back to the equation:

-(2y+21)



We get rid of parentheses

-2y-21+60=0

We add all the numbers together, and all the variables

-2y+39=0

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

-2y=-39

y=-39/-2

y=19+1/2

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