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1*4y+2*6y=84
We move all terms to the left:
1*4y+2*6y-(84)=0
Wy multiply elements
4y+12y-84=0
We add all the numbers together, and all the variables
16y-84=0
We move all terms containing y to the left, all other terms to the right
16y=84
y=84/16
y=5+1/4
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