-2.1(0.9)=x

Solution for -2.1(0.9)=x equation:

Simplifying
-2.1(0.9) = x

Multiply -2.1 * 0.9
-1.89 = x

Solving
-1.89 = 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.
-1.89 + -1x = x + -1x

Combine like terms: x + -1x = 0
-1.89 + -1x = 0

Add '1.89' to each side of the equation.
-1.89 + 1.89 + -1x = 0 + 1.89

Combine like terms: -1.89 + 1.89 = 0.00
0.00 + -1x = 0 + 1.89
-1x = 0 + 1.89

Combine like terms: 0 + 1.89 = 1.89
-1x = 1.89

Divide each side by '-1'.
x = -1.89

Simplifying
x = -1.89