11-(3a+7a)=-21

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Solution for 11-(3a+7a)=-21 equation: 


Simplifying
11 + -1(3a + 7a) = -21

Combine like terms: 3a + 7a = 10a
11 + -1(10a) = -21

Remove parenthesis around (10a)
11 + -1 * 10a = -21

Multiply -1 * 10
11 + -10a = -21

Solving
11 + -10a = -21

Solving for variable 'a'.

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

Add '-11' to each side of the equation.
11 + -11 + -10a = -21 + -11

Combine like terms: 11 + -11 = 0
0 + -10a = -21 + -11
-10a = -21 + -11

Combine like terms: -21 + -11 = -32
-10a = -32

Divide each side by '-10'.
a = 3.2

Simplifying
a = 3.2

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