2a+3a-6a-7=21+a+4

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Solution for 2a+3a-6a-7=21+a+4 equation:


Simplifying
2a + 3a + -6a + -7 = 21 + a + 4

Reorder the terms:
-7 + 2a + 3a + -6a = 21 + a + 4

Combine like terms: 2a + 3a = 5a
-7 + 5a + -6a = 21 + a + 4

Combine like terms: 5a + -6a = -1a
-7 + -1a = 21 + a + 4

Reorder the terms:
-7 + -1a = 21 + 4 + a

Combine like terms: 21 + 4 = 25
-7 + -1a = 25 + a

Solving
-7 + -1a = 25 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-7 + -1a + -1a = 25 + a + -1a

Combine like terms: -1a + -1a = -2a
-7 + -2a = 25 + a + -1a

Combine like terms: a + -1a = 0
-7 + -2a = 25 + 0
-7 + -2a = 25

Add '7' to each side of the equation.
-7 + 7 + -2a = 25 + 7

Combine like terms: -7 + 7 = 0
0 + -2a = 25 + 7
-2a = 25 + 7

Combine like terms: 25 + 7 = 32
-2a = 32

Divide each side by '-2'.
a = -16

Simplifying
a = -16

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