9t-21=-87

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Solution for 9t-21=-87 equation: 


Simplifying
9t + -21 = -87

Reorder the terms:
-21 + 9t = -87

Solving
-21 + 9t = -87

Solving for variable 't'.

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

Add '21' to each side of the equation.
-21 + 21 + 9t = -87 + 21

Combine like terms: -21 + 21 = 0
0 + 9t = -87 + 21
9t = -87 + 21

Combine like terms: -87 + 21 = -66
9t = -66

Divide each side by '9'.
t = -7.333333333

Simplifying
t = -7.333333333

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