15a-4-13(a+2)=20

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Solution for 15a-4-13(a+2)=20 equation:


Simplifying
15a + -4 + -13(a + 2) = 20

Reorder the terms:
15a + -4 + -13(2 + a) = 20
15a + -4 + (2 * -13 + a * -13) = 20
15a + -4 + (-26 + -13a) = 20

Reorder the terms:
-4 + -26 + 15a + -13a = 20

Combine like terms: -4 + -26 = -30
-30 + 15a + -13a = 20

Combine like terms: 15a + -13a = 2a
-30 + 2a = 20

Solving
-30 + 2a = 20

Solving for variable 'a'.

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

Add '30' to each side of the equation.
-30 + 30 + 2a = 20 + 30

Combine like terms: -30 + 30 = 0
0 + 2a = 20 + 30
2a = 20 + 30

Combine like terms: 20 + 30 = 50
2a = 50

Divide each side by '2'.
a = 25

Simplifying
a = 25

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