7-3x=400

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Solution for 7-3x=400 equation: 


Simplifying
7 + -3x = 400

Solving
7 + -3x = 400

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + -3x = 400 + -7

Combine like terms: 7 + -7 = 0
0 + -3x = 400 + -7
-3x = 400 + -7

Combine like terms: 400 + -7 = 393
-3x = 393

Divide each side by '-3'.
x = -131

Simplifying
x = -131

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