0.40x+0.45(20)=0.20(31)

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Solution for 0.40x+0.45(20)=0.20(31) equation: 


Simplifying
0.40x + 0.45(20) = 0.20(31)

Multiply 0.45 * 20
0.40x + 9 = 0.20(31)

Reorder the terms:
9 + 0.40x = 0.20(31)

Multiply 0.20 * 31
9 + 0.40x = 6.2

Solving
9 + 0.40x = 6.2

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 0.40x = 6.2 + -9

Combine like terms: 9 + -9 = 0
0 + 0.40x = 6.2 + -9
0.40x = 6.2 + -9

Combine like terms: 6.2 + -9 = -2.8
0.40x = -2.8

Divide each side by '0.40'.
x = -7

Simplifying
x = -7

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