0.1(x+90)+0.3x=13

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Solution for 0.1(x+90)+0.3x=13 equation:


Simplifying
0.1(x + 90) + 0.3x = 13

Reorder the terms:
0.1(90 + x) + 0.3x = 13
(90 * 0.1 + x * 0.1) + 0.3x = 13
(9 + 0.1x) + 0.3x = 13

Combine like terms: 0.1x + 0.3x = 0.4x
9 + 0.4x = 13

Solving
9 + 0.4x = 13

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 + 0.4x = 13 + -9

Combine like terms: 9 + -9 = 0
0 + 0.4x = 13 + -9
0.4x = 13 + -9

Combine like terms: 13 + -9 = 4
0.4x = 4

Divide each side by '0.4'.
x = 10

Simplifying
x = 10

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