12=20-4t

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Solution for 12=20-4t equation:


Simplifying
12 = 20 + -4t

Solving
12 = 20 + -4t

Solving for variable 't'.

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

Add '4t' to each side of the equation.
12 + 4t = 20 + -4t + 4t

Combine like terms: -4t + 4t = 0
12 + 4t = 20 + 0
12 + 4t = 20

Add '-12' to each side of the equation.
12 + -12 + 4t = 20 + -12

Combine like terms: 12 + -12 = 0
0 + 4t = 20 + -12
4t = 20 + -12

Combine like terms: 20 + -12 = 8
4t = 8

Divide each side by '4'.
t = 2

Simplifying
t = 2

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