-3(0)-7y=21

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Solution for -3(0)-7y=21 equation: 


Simplifying
-3(0) + -7y = 21

Multiply -3 * 0
0 + -7y = 21

Anything times zero is zero.
0 + -7y = 21
Remove the zero:
-7y = 21

Solving
-7y = 21

Solving for variable 'y'.

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

Divide each side by '-7'.
y = -3

Simplifying
y = -3

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