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

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


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

Reorder the terms:
-13 = 7 + 4(15 + 2a)
-13 = 7 + (15 * 4 + 2a * 4)
-13 = 7 + (60 + 8a)

Combine like terms: 7 + 60 = 67
-13 = 67 + 8a

Solving
-13 = 67 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
-13 + -8a = 67 + 8a + -8a

Combine like terms: 8a + -8a = 0
-13 + -8a = 67 + 0
-13 + -8a = 67

Add '13' to each side of the equation.
-13 + 13 + -8a = 67 + 13

Combine like terms: -13 + 13 = 0
0 + -8a = 67 + 13
-8a = 67 + 13

Combine like terms: 67 + 13 = 80
-8a = 80

Divide each side by '-8'.
a = -10

Simplifying
a = -10

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