13.1=0.3X+7

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Solution for 13.1=0.3X+7 equation: 


Simplifying
13.1 = 0.3X + 7

Reorder the terms:
13.1 = 7 + 0.3X

Solving
13.1 = 7 + 0.3X

Solving for variable 'X'.

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

Add '-0.3X' to each side of the equation.
13.1 + -0.3X = 7 + 0.3X + -0.3X

Combine like terms: 0.3X + -0.3X = 0.0
13.1 + -0.3X = 7 + 0.0
13.1 + -0.3X = 7

Add '-13.1' to each side of the equation.
13.1 + -13.1 + -0.3X = 7 + -13.1

Combine like terms: 13.1 + -13.1 = 0.0
0.0 + -0.3X = 7 + -13.1
-0.3X = 7 + -13.1

Combine like terms: 7 + -13.1 = -6.1
-0.3X = -6.1

Divide each side by '-0.3'.
X = 20.33333333

Simplifying
X = 20.33333333

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