30+18x=21.90

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Solution for 30+18x=21.90 equation: 


Simplifying
30 + 18x = 21.90

Solving
30 + 18x = 21.90

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 + 18x = 21.90 + -30

Combine like terms: 30 + -30 = 0
0 + 18x = 21.90 + -30
18x = 21.90 + -30

Combine like terms: 21.90 + -30 = -8.1
18x = -8.1

Divide each side by '18'.
x = -0.45

Simplifying
x = -0.45

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