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y+7+2y=-14+3y+21
We simplify the equation to the form, which is simple to understand
y+7+2y=-14+3y+21
We move all terms containing y to the left and all other terms to the right.
+1y+2y-3y=-14+21-7
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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