-7a-3(a-7)=81

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Solution for -7a-3(a-7)=81 equation:


Simplifying
-7a + -3(a + -7) = 81

Reorder the terms:
-7a + -3(-7 + a) = 81
-7a + (-7 * -3 + a * -3) = 81
-7a + (21 + -3a) = 81

Reorder the terms:
21 + -7a + -3a = 81

Combine like terms: -7a + -3a = -10a
21 + -10a = 81

Solving
21 + -10a = 81

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + -10a = 81 + -21

Combine like terms: 21 + -21 = 0
0 + -10a = 81 + -21
-10a = 81 + -21

Combine like terms: 81 + -21 = 60
-10a = 60

Divide each side by '-10'.
a = -6

Simplifying
a = -6

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