Solve 0.135x+0.09(30000-x)=3330
Expanding the bracketed term,
0.135x + 9*300 - 0.09x = 3330
now group the x-terms together
(0.135 - 0.09)x + 2700 = 3330
Simplify,
0.045x = 630
divide both sides by 0.045
x = 630/0.045 = 630000/45 = 9*7*10000/45 = 70000/5 = 14000
Answer: x = 14,000