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y=-6400+130y
We move all terms to the left:
y-(-6400+130y)=0
We add all the numbers together, and all the variables
y-(130y-6400)=0
We get rid of parentheses
y-130y+6400=0
We add all the numbers together, and all the variables
-129y+6400=0
We move all terms containing y to the left, all other terms to the right
-129y=-6400
y=-6400/-129
y=49+79/129
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