3.1(-1.3)=x

Solution for 3.1(-1.3)=x equation:

Simplifying
3.1(-1.3) = x

Multiply 3.1 * -1.3
-4.03 = x

Solving
-4.03 = 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.
-4.03 + -1x = x + -1x

Combine like terms: x + -1x = 0
-4.03 + -1x = 0

Add '4.03' to each side of the equation.
-4.03 + 4.03 + -1x = 0 + 4.03

Combine like terms: -4.03 + 4.03 = 0.00
0.00 + -1x = 0 + 4.03
-1x = 0 + 4.03

Combine like terms: 0 + 4.03 = 4.03
-1x = 4.03

Divide each side by '-1'.
x = -4.03

Simplifying
x = -4.03