7*(-2.1/7)-y-4=0

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Solution for 7*(-2.1/7)-y-4=0 equation:


7*(-2.1/7)-y-4=0

We simplify the equation to the form, which is simple to understand 
7*(-2.1/7)-y-4=0

Simplifying:
7*(-0.3)-y-4=0

Reorder the terms in parentheses
+(-2.1)-y-4=0

Remove unnecessary parentheses
-2.1-y-4=0

We move all terms containing y to the left and all other terms to the right. 
-1y=0+2.1+4

We simplify left and right side of the equation. 
-1y=+6.1

We divide both sides of the equation by -1 to get y. 
y=-6.1

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