1+a+2=7

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Solution for 1+a+2=7 equation: 


Simplifying
1 + a + 2 = 7

Reorder the terms:
1 + 2 + a = 7

Combine like terms: 1 + 2 = 3
3 + a = 7

Solving
3 + a = 7

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + a = 7 + -3

Combine like terms: 3 + -3 = 0
0 + a = 7 + -3
a = 7 + -3

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

Simplifying
a = 4

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