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y+y+90-y+90-y=180
We simplify the equation to the form, which is simple to understand
y+y+90-y+90-y=180
We move all terms containing y to the left and all other terms to the right.
+1y+1y-1y-1y=+180-90-90
We simplify left and right side of the equation.
y=0
0=0
This equation is an identity, so all real numbers are solutions.
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