4*0-7y=28

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Solution for 4*0-7y=28 equation: 


Simplifying
4 * 0 + -7y = 28

Multiply 4 * 0
0 + -7y = 28

Anything times zero is zero.
0 + -7y = 28
Remove the zero:
-7y = 28

Solving
-7y = 28

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Divide each side by '-7'.
y = -4

Simplifying
y = -4

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