7x-30=40

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Solution for 7x-30=40 equation: 


Simplifying
7x + -30 = 40

Reorder the terms:
-30 + 7x = 40

Solving
-30 + 7x = 40

Solving for variable 'x'.

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

Add '30' to each side of the equation.
-30 + 30 + 7x = 40 + 30

Combine like terms: -30 + 30 = 0
0 + 7x = 40 + 30
7x = 40 + 30

Combine like terms: 40 + 30 = 70
7x = 70

Divide each side by '7'.
x = 10

Simplifying
x = 10

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