2t+5+4t-8=21

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Solution for 2t+5+4t-8=21 equation:


Simplifying
2t + 5 + 4t + -8 = 21

Reorder the terms:
5 + -8 + 2t + 4t = 21

Combine like terms: 5 + -8 = -3
-3 + 2t + 4t = 21

Combine like terms: 2t + 4t = 6t
-3 + 6t = 21

Solving
-3 + 6t = 21

Solving for variable 't'.

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

Add '3' to each side of the equation.
-3 + 3 + 6t = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 6t = 21 + 3
6t = 21 + 3

Combine like terms: 21 + 3 = 24
6t = 24

Divide each side by '6'.
t = 4

Simplifying
t = 4

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