3-4a=7

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Solution for 3-4a=7 equation: 


Simplifying
3 + -4a = 7

Solving
3 + -4a = 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 + -4a = 7 + -3

Combine like terms: 3 + -3 = 0
0 + -4a = 7 + -3
-4a = 7 + -3

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

Divide each side by '-4'.
a = -1

Simplifying
a = -1

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