5t+7-9t=21

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Solution for 5t+7-9t=21 equation: 


Simplifying
5t + 7 + -9t = 21

Reorder the terms:
7 + 5t + -9t = 21

Combine like terms: 5t + -9t = -4t
7 + -4t = 21

Solving
7 + -4t = 21

Solving for variable 't'.

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

Add '-7' to each side of the equation.
7 + -7 + -4t = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -4t = 21 + -7
-4t = 21 + -7

Combine like terms: 21 + -7 = 14
-4t = 14

Divide each side by '-4'.
t = -3.5

Simplifying
t = -3.5

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