3+7x=a

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Solution for 3+7x=a equation: 


Simplifying
3 + 7x = a

Solving
3 + 7x = a

Solving for variable 'x'.

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

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

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

Divide each side by '7'.
x = -0.4285714286 + 0.1428571429a

Simplifying
x = -0.4285714286 + 0.1428571429a

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