2y-(7-5y)21=0

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Solution for 2y-(7-5y)21=0 equation: 



2y-(7-5y)21=0

We add all the numbers together, and all the variables

2y-(-5y+7)21=0

We multiply parentheses

2y+105y-147=0

We add all the numbers together, and all the variables

107y-147=0

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

107y=147

y=147/107

y=1+40/107

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