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y+21*2=180
We simplify the equation to the form, which is simple to understand
y+21*2=180
Simplifying:
y+42=180
We move all terms containing y to the left and all other terms to the right.
+1y=+180-42
We simplify left and right side of the equation.
+1y=+138
We divide both sides of the equation by 1 to get y.
y=138
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