3(t-21)=45

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Solution for 3(t-21)=45 equation: 


Simplifying
3(t + -21) = 45

Reorder the terms:
3(-21 + t) = 45
(-21 * 3 + t * 3) = 45
(-63 + 3t) = 45

Solving
-63 + 3t = 45

Solving for variable 't'.

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

Add '63' to each side of the equation.
-63 + 63 + 3t = 45 + 63

Combine like terms: -63 + 63 = 0
0 + 3t = 45 + 63
3t = 45 + 63

Combine like terms: 45 + 63 = 108
3t = 108

Divide each side by '3'.
t = 36

Simplifying
t = 36

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