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7y-6.9=4
We move all terms to the left:
7y-6.9-(4)=0
We add all the numbers together, and all the variables
7y-10.9=0
We move all terms containing y to the left, all other terms to the right
7y=10.9
y=10.9/7
y=1+2.0526315789474/3.6842105263158
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