21+9t-(5t-7)=-8

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Solution for 21+9t-(5t-7)=-8 equation:


Simplifying
21 + 9t + -1(5t + -7) = -8

Reorder the terms:
21 + 9t + -1(-7 + 5t) = -8
21 + 9t + (-7 * -1 + 5t * -1) = -8
21 + 9t + (7 + -5t) = -8

Reorder the terms:
21 + 7 + 9t + -5t = -8

Combine like terms: 21 + 7 = 28
28 + 9t + -5t = -8

Combine like terms: 9t + -5t = 4t
28 + 4t = -8

Solving
28 + 4t = -8

Solving for variable 't'.

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

Add '-28' to each side of the equation.
28 + -28 + 4t = -8 + -28

Combine like terms: 28 + -28 = 0
0 + 4t = -8 + -28
4t = -8 + -28

Combine like terms: -8 + -28 = -36
4t = -36

Divide each side by '4'.
t = -9

Simplifying
t = -9

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