(7t-21)+(t-4)=15

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Solution for (7t-21)+(t-4)=15 equation:


Simplifying
(7t + -21) + (t + -4) = 15

Reorder the terms:
(-21 + 7t) + (t + -4) = 15

Remove parenthesis around (-21 + 7t)
-21 + 7t + (t + -4) = 15

Reorder the terms:
-21 + 7t + (-4 + t) = 15

Remove parenthesis around (-4 + t)
-21 + 7t + -4 + t = 15

Reorder the terms:
-21 + -4 + 7t + t = 15

Combine like terms: -21 + -4 = -25
-25 + 7t + t = 15

Combine like terms: 7t + t = 8t
-25 + 8t = 15

Solving
-25 + 8t = 15

Solving for variable 't'.

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

Add '25' to each side of the equation.
-25 + 25 + 8t = 15 + 25

Combine like terms: -25 + 25 = 0
0 + 8t = 15 + 25
8t = 15 + 25

Combine like terms: 15 + 25 = 40
8t = 40

Divide each side by '8'.
t = 5

Simplifying
t = 5

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