6=0.7x-0.8x-3

Solution for 6=0.7x-0.8x-3 equation:

Simplifying
6 = 0.7x + -0.8x + -3

Reorder the terms:
6 = -3 + 0.7x + -0.8x

Combine like terms: 0.7x + -0.8x = -0.1x
6 = -3 + -0.1x

Solving
6 = -3 + -0.1x

Solving for variable 'x'.

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

Add '0.1x' to each side of the equation.
6 + 0.1x = -3 + -0.1x + 0.1x

Combine like terms: -0.1x + 0.1x = 0.0
6 + 0.1x = -3 + 0.0
6 + 0.1x = -3

Add '-6' to each side of the equation.
6 + -6 + 0.1x = -3 + -6

Combine like terms: 6 + -6 = 0
0 + 0.1x = -3 + -6
0.1x = -3 + -6

Combine like terms: -3 + -6 = -9
0.1x = -9

Divide each side by '0.1'.
x = -90

Simplifying
x = -90