2a+9(-1)=7

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Solution for 2a+9(-1)=7 equation: 


Simplifying
2a + 9(-1) = 7

Multiply 9 * -1
2a + -9 = 7

Reorder the terms:
-9 + 2a = 7

Solving
-9 + 2a = 7

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 2a = 7 + 9

Combine like terms: -9 + 9 = 0
0 + 2a = 7 + 9
2a = 7 + 9

Combine like terms: 7 + 9 = 16
2a = 16

Divide each side by '2'.
a = 8

Simplifying
a = 8

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