2a+7a+13a+(-5a)-15a-4=-10

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Solution for 2a+7a+13a+(-5a)-15a-4=-10 equation: 


Simplifying
2a + 7a + 13a + (-5a) + -15a + -4 = -10

Reorder the terms:
-4 + 2a + 7a + 13a + (-5a) + -15a = -10

Combine like terms: 2a + 7a = 9a
-4 + 9a + 13a + (-5a) + -15a = -10

Combine like terms: 9a + 13a = 22a
-4 + 22a + (-5a) + -15a = -10

Combine like terms: 22a + (-5a) = 17a
-4 + 17a + -15a = -10

Combine like terms: 17a + -15a = 2a
-4 + 2a = -10

Solving
-4 + 2a = -10

Solving for variable 'a'.

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

Add '4' to each side of the equation.
-4 + 4 + 2a = -10 + 4

Combine like terms: -4 + 4 = 0
0 + 2a = -10 + 4
2a = -10 + 4

Combine like terms: -10 + 4 = -6
2a = -6

Divide each side by '2'.
a = -3

Simplifying
a = -3

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