.75(4.2)=x

Solution for .75(4.2)=x equation:

Simplifying
0.75(4.2) = x

Multiply 0.75 * 4.2
3.15 = x

Solving
3.15 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
3.15 + -1x = x + -1x

Combine like terms: x + -1x = 0
3.15 + -1x = 0

Add '-3.15' to each side of the equation.
3.15 + -3.15 + -1x = 0 + -3.15

Combine like terms: 3.15 + -3.15 = 0.00
0.00 + -1x = 0 + -3.15
-1x = 0 + -3.15

Combine like terms: 0 + -3.15 = -3.15
-1x = -3.15

Divide each side by '-1'.
x = 3.15

Simplifying
x = 3.15