21-7t-5t=t-5

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Solution for 21-7t-5t=t-5 equation:


Simplifying
21 + -7t + -5t = t + -5

Combine like terms: -7t + -5t = -12t
21 + -12t = t + -5

Reorder the terms:
21 + -12t = -5 + t

Solving
21 + -12t = -5 + t

Solving for variable 't'.

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

Add '-1t' to each side of the equation.
21 + -12t + -1t = -5 + t + -1t

Combine like terms: -12t + -1t = -13t
21 + -13t = -5 + t + -1t

Combine like terms: t + -1t = 0
21 + -13t = -5 + 0
21 + -13t = -5

Add '-21' to each side of the equation.
21 + -21 + -13t = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -13t = -5 + -21
-13t = -5 + -21

Combine like terms: -5 + -21 = -26
-13t = -26

Divide each side by '-13'.
t = 2

Simplifying
t = 2

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