3(10x+y)=42

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Solution for 3(10x+y)=42 equation: 


Simplifying
3(10x + y) = 42
(10x * 3 + y * 3) = 42
(30x + 3y) = 42

Solving
30x + 3y = 42

Solving for variable 'x'.

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

Add '-3y' to each side of the equation.
30x + 3y + -3y = 42 + -3y

Combine like terms: 3y + -3y = 0
30x + 0 = 42 + -3y
30x = 42 + -3y

Divide each side by '30'.
x = 1.4 + -0.1y

Simplifying
x = 1.4 + -0.1y

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