7x-(0)=21

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Solution for 7x-(0)=21 equation: 


Simplifying
7x + -1(0) = 21

Multiply -1 * 0
7x + 0 = 21

Anything times zero is zero.
7x + 0 = 21

Reorder the terms:
0 + 7x = 21
Remove the zero:
7x = 21

Solving
7x = 21

Solving for variable 'x'.

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

Divide each side by '7'.
x = 3

Simplifying
x = 3

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