7a+6a-11+15-17+20-6a=-7

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Solution for 7a+6a-11+15-17+20-6a=-7 equation: 


Simplifying
7a + 6a + -11 + 15 + -17 + 20 + -6a = -7

Reorder the terms:
-11 + 15 + -17 + 20 + 7a + 6a + -6a = -7

Combine like terms: -11 + 15 = 4
4 + -17 + 20 + 7a + 6a + -6a = -7

Combine like terms: 4 + -17 = -13
-13 + 20 + 7a + 6a + -6a = -7

Combine like terms: -13 + 20 = 7
7 + 7a + 6a + -6a = -7

Combine like terms: 7a + 6a = 13a
7 + 13a + -6a = -7

Combine like terms: 13a + -6a = 7a
7 + 7a = -7

Solving
7 + 7a = -7

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 7a = -7 + -7

Combine like terms: 7 + -7 = 0
0 + 7a = -7 + -7
7a = -7 + -7

Combine like terms: -7 + -7 = -14
7a = -14

Divide each side by '7'.
a = -2

Simplifying
a = -2

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