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2.8=-0.9y
We move all terms to the left:
2.8-(-0.9y)=0
We get rid of parentheses
0.9y+2.8=0
We move all terms containing y to the left, all other terms to the right
0.9y=-2.8
y=-2.8/0.9
y=-3+0.1/0.9
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