3y-15=4*30

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Solution for 3y-15=4*30 equation: 



3y-15=4*30

We move all terms to the left:

3y-15-(4*30)=0

We add all the numbers together, and all the variables

3y-15-120=0

We add all the numbers together, and all the variables

3y-135=0

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

3y=135

y=135/3

y=45

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