7x-3(-21)=21

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Solution for 7x-3(-21)=21 equation: 


Simplifying
7x + -3(-21) = 21

Multiply -3 * -21
7x + 63 = 21

Reorder the terms:
63 + 7x = 21

Solving
63 + 7x = 21

Solving for variable 'x'.

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

Add '-63' to each side of the equation.
63 + -63 + 7x = 21 + -63

Combine like terms: 63 + -63 = 0
0 + 7x = 21 + -63
7x = 21 + -63

Combine like terms: 21 + -63 = -42
7x = -42

Divide each side by '7'.
x = -6

Simplifying
x = -6

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