-21=-7+2u

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Solution for -21=-7+2u equation:


Simplifying
-21 = -7 + 2u

Solving
-21 = -7 + 2u

Solving for variable 'u'.

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

Add '-2u' to each side of the equation.
-21 + -2u = -7 + 2u + -2u

Combine like terms: 2u + -2u = 0
-21 + -2u = -7 + 0
-21 + -2u = -7

Add '21' to each side of the equation.
-21 + 21 + -2u = -7 + 21

Combine like terms: -21 + 21 = 0
0 + -2u = -7 + 21
-2u = -7 + 21

Combine like terms: -7 + 21 = 14
-2u = 14

Divide each side by '-2'.
u = -7

Simplifying
u = -7

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