0.80x+0.05(12-x)=0.10(-84)

Solution for 0.80x+0.05(12-x)=0.10(-84) equation:

Simplifying
0.80x + 0.05(12 + -1x) = 0.10(-84)
0.80x + (12 * 0.05 + -1x * 0.05) = 0.10(-84)
0.80x + (0.6 + -0.05x) = 0.10(-84)

Reorder the terms:
0.6 + 0.80x + -0.05x = 0.10(-84)

Combine like terms: 0.80x + -0.05x = 0.75x
0.6 + 0.75x = 0.10(-84)

Multiply 0.10 * -84
0.6 + 0.75x = -8.4

Solving
0.6 + 0.75x = -8.4

Solving for variable 'x'.

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

Add '-0.6' to each side of the equation.
0.6 + -0.6 + 0.75x = -8.4 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + 0.75x = -8.4 + -0.6
0.75x = -8.4 + -0.6

Combine like terms: -8.4 + -0.6 = -9
0.75x = -9

Divide each side by '0.75'.
x = -12

Simplifying
x = -12