4-7a+15-8a-21=

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Solution for 4-7a+15-8a-21= equation:


Simplifying
4 + -7a + 15 + -8a + -21 = 0

Reorder the terms:
4 + 15 + -21 + -7a + -8a = 0

Combine like terms: 4 + 15 = 19
19 + -21 + -7a + -8a = 0

Combine like terms: 19 + -21 = -2
-2 + -7a + -8a = 0

Combine like terms: -7a + -8a = -15a
-2 + -15a = 0

Solving
-2 + -15a = 0

Solving for variable 'a'.

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

Add '2' to each side of the equation.
-2 + 2 + -15a = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -15a = 0 + 2
-15a = 0 + 2

Combine like terms: 0 + 2 = 2
-15a = 2

Divide each side by '-15'.
a = -0.1333333333

Simplifying
a = -0.1333333333

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