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2*10+y=19
We simplify the equation to the form, which is simple to understand
2*10+y=19
Simplifying:
+20+y=19
We move all terms containing y to the left and all other terms to the right.
+1y=+19-20
We simplify left and right side of the equation.
+1y=-1
We divide both sides of the equation by 1 to get y.
y=-1
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