-3x+7y*0=-21

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Solution for -3x+7y*0=-21 equation: 


Simplifying
-3x + 7y * 0 = -21

Reorder the terms for easier multiplication:
-3x + 7 * 0y = -21

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

Anything times zero is zero.
-3x + 0y = -21

Reorder the terms:
0 + -3x = -21
Remove the zero:
-3x = -21

Solving
-3x = -21

Solving for variable 'x'.

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

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

Simplifying
x = 7

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