.07x+.13(4000-x)=

Solution for .07x+.13(4000-x)= equation:

Simplifying
0.07x + 0.13(4000 + -1x) = 0
0.07x + (4000 * 0.13 + -1x * 0.13) = 0
0.07x + (520 + -0.13x) = 0

Reorder the terms:
520 + 0.07x + -0.13x = 0

Combine like terms: 0.07x + -0.13x = -0.06x
520 + -0.06x = 0

Solving
520 + -0.06x = 0

Solving for variable 'x'.

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

Add '-520' to each side of the equation.
520 + -520 + -0.06x = 0 + -520

Combine like terms: 520 + -520 = 0
0 + -0.06x = 0 + -520
-0.06x = 0 + -520

Combine like terms: 0 + -520 = -520
-0.06x = -520

Divide each side by '-0.06'.
x = 8666.666667

Simplifying
x = 8666.666667