30+40-x=20

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Solution for 30+40-x=20 equation: 


Simplifying
30 + 40 + -1x = 20

Combine like terms: 30 + 40 = 70
70 + -1x = 20

Solving
70 + -1x = 20

Solving for variable 'x'.

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

Add '-70' to each side of the equation.
70 + -70 + -1x = 20 + -70

Combine like terms: 70 + -70 = 0
0 + -1x = 20 + -70
-1x = 20 + -70

Combine like terms: 20 + -70 = -50
-1x = -50

Divide each side by '-1'.
x = 50

Simplifying
x = 50

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