0.55x+0.45(4-x)=0.3(-1)

Solution for 0.55x+0.45(4-x)=0.3(-1) equation:

Simplifying
0.55x + 0.45(4 + -1x) = 0.3(-1)
0.55x + (4 * 0.45 + -1x * 0.45) = 0.3(-1)
0.55x + (1.8 + -0.45x) = 0.3(-1)

Reorder the terms:
1.8 + 0.55x + -0.45x = 0.3(-1)

Combine like terms: 0.55x + -0.45x = 0.1x
1.8 + 0.1x = 0.3(-1)

Multiply 0.3 * -1
1.8 + 0.1x = -0.3

Solving
1.8 + 0.1x = -0.3

Solving for variable 'x'.

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

Add '-1.8' to each side of the equation.
1.8 + -1.8 + 0.1x = -0.3 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + 0.1x = -0.3 + -1.8
0.1x = -0.3 + -1.8

Combine like terms: -0.3 + -1.8 = -2.1
0.1x = -2.1

Divide each side by '0.1'.
x = -21

Simplifying
x = -21