2(t-1)=20

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Solution for 2(t-1)=20 equation: 


Simplifying
2(t + -1) = 20

Reorder the terms:
2(-1 + t) = 20
(-1 * 2 + t * 2) = 20
(-2 + 2t) = 20

Solving
-2 + 2t = 20

Solving for variable 't'.

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

Add '2' to each side of the equation.
-2 + 2 + 2t = 20 + 2

Combine like terms: -2 + 2 = 0
0 + 2t = 20 + 2
2t = 20 + 2

Combine like terms: 20 + 2 = 22
2t = 22

Divide each side by '2'.
t = 11

Simplifying
t = 11

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