12=j+3j

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Solution for 12=j+3j equation:


Simplifying
12 = j + 3j

Combine like terms: j + 3j = 4j
12 = 4j

Solving
12 = 4j

Solving for variable 'j'.

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

Add '-4j' to each side of the equation.
12 + -4j = 4j + -4j

Combine like terms: 4j + -4j = 0
12 + -4j = 0

Add '-12' to each side of the equation.
12 + -12 + -4j = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -4j = 0 + -12
-4j = 0 + -12

Combine like terms: 0 + -12 = -12
-4j = -12

Divide each side by '-4'.
j = 3

Simplifying
j = 3

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