a+3a-2-2-7a=8

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Solution for a+3a-2-2-7a=8 equation:


Simplifying
a + 3a + -2 + -2 + -7a = 8

Reorder the terms:
-2 + -2 + a + 3a + -7a = 8

Combine like terms: -2 + -2 = -4
-4 + a + 3a + -7a = 8

Combine like terms: a + 3a = 4a
-4 + 4a + -7a = 8

Combine like terms: 4a + -7a = -3a
-4 + -3a = 8

Solving
-4 + -3a = 8

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 + -3a = 8 + 4

Combine like terms: -4 + 4 = 0
0 + -3a = 8 + 4
-3a = 8 + 4

Combine like terms: 8 + 4 = 12
-3a = 12

Divide each side by '-3'.
a = -4

Simplifying
a = -4

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