42.12=7.8x

Solution for 42.12=7.8x equation:

Simplifying
42.12 = 7.8x

Solving
42.12 = 7.8x

Solving for variable 'x'.

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

Add '-7.8x' to each side of the equation.
42.12 + -7.8x = 7.8x + -7.8x

Combine like terms: 7.8x + -7.8x = 0.0
42.12 + -7.8x = 0.0

Add '-42.12' to each side of the equation.
42.12 + -42.12 + -7.8x = 0.0 + -42.12

Combine like terms: 42.12 + -42.12 = 0.00
0.00 + -7.8x = 0.0 + -42.12
-7.8x = 0.0 + -42.12

Combine like terms: 0.0 + -42.12 = -42.12
-7.8x = -42.12

Divide each side by '-7.8'.
x = 5.4

Simplifying
x = 5.4