3u-9=4u+12

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Solution for 3u-9=4u+12 equation:


Simplifying
3u + -9 = 4u + 12

Reorder the terms:
-9 + 3u = 4u + 12

Reorder the terms:
-9 + 3u = 12 + 4u

Solving
-9 + 3u = 12 + 4u

Solving for variable 'u'.

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

Add '-4u' to each side of the equation.
-9 + 3u + -4u = 12 + 4u + -4u

Combine like terms: 3u + -4u = -1u
-9 + -1u = 12 + 4u + -4u

Combine like terms: 4u + -4u = 0
-9 + -1u = 12 + 0
-9 + -1u = 12

Add '9' to each side of the equation.
-9 + 9 + -1u = 12 + 9

Combine like terms: -9 + 9 = 0
0 + -1u = 12 + 9
-1u = 12 + 9

Combine like terms: 12 + 9 = 21
-1u = 21

Divide each side by '-1'.
u = -21

Simplifying
u = -21

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