t+t-4t+8=21

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


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

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

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

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

Solving
8 + -2t = 21

Solving for variable 't'.

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

Add '-8' to each side of the equation.
8 + -8 + -2t = 21 + -8

Combine like terms: 8 + -8 = 0
0 + -2t = 21 + -8
-2t = 21 + -8

Combine like terms: 21 + -8 = 13
-2t = 13

Divide each side by '-2'.
t = -6.5

Simplifying
t = -6.5

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