21*-1.5=x

Solution for 21*-1.5=x equation:

Simplifying
21 * -1.5 = x

Multiply 21 * -1.5
-31.5 = x

Solving
-31.5 = 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.
-31.5 + -1x = x + -1x

Combine like terms: x + -1x = 0
-31.5 + -1x = 0

Add '31.5' to each side of the equation.
-31.5 + 31.5 + -1x = 0 + 31.5

Combine like terms: -31.5 + 31.5 = 0.0
0.0 + -1x = 0 + 31.5
-1x = 0 + 31.5

Combine like terms: 0 + 31.5 = 31.5
-1x = 31.5

Divide each side by '-1'.
x = -31.5

Simplifying
x = -31.5