.3(X+90)+.1X=31

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Solution for .3(X+90)+.1X=31 equation:


Simplifying
0.3(X + 90) + 0.1X = 31

Reorder the terms:
0.3(90 + X) + 0.1X = 31
(90 * 0.3 + X * 0.3) + 0.1X = 31
(27 + 0.3X) + 0.1X = 31

Combine like terms: 0.3X + 0.1X = 0.4X
27 + 0.4X = 31

Solving
27 + 0.4X = 31

Solving for variable 'X'.

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

Add '-27' to each side of the equation.
27 + -27 + 0.4X = 31 + -27

Combine like terms: 27 + -27 = 0
0 + 0.4X = 31 + -27
0.4X = 31 + -27

Combine like terms: 31 + -27 = 4
0.4X = 4

Divide each side by '0.4'.
X = 10

Simplifying
X = 10

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