30=20+0.20(x-40)

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Solution for 30=20+0.20(x-40) equation: 


Simplifying
30 = 20 + 0.20(x + -40)

Reorder the terms:
30 = 20 + 0.20(-40 + x)
30 = 20 + (-40 * 0.20 + x * 0.20)
30 = 20 + (-8 + 0.20x)

Combine like terms: 20 + -8 = 12
30 = 12 + 0.20x

Solving
30 = 12 + 0.20x

Solving for variable 'x'.

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

Add '-0.20x' to each side of the equation.
30 + -0.20x = 12 + 0.20x + -0.20x

Combine like terms: 0.20x + -0.20x = 0.00
30 + -0.20x = 12 + 0.00
30 + -0.20x = 12

Add '-30' to each side of the equation.
30 + -30 + -0.20x = 12 + -30

Combine like terms: 30 + -30 = 0
0 + -0.20x = 12 + -30
-0.20x = 12 + -30

Combine like terms: 12 + -30 = -18
-0.20x = -18

Divide each side by '-0.20'.
x = 90

Simplifying
x = 90

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