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2014-02-11T19:57:24+02:00
 \frac{1}{3} = \frac{b}{5}  ⇒ b=5/3
2x(10a-4b)= 7(5a+b) ⇒ x=7(5a+b)/2(10a-4b)
5a+b=5a+5/3=15a+5/3
10a-4b=10a-4*5/3=30a-20/3
x=7*(15a+5)/3 *1*3/2(30a-20)
x=7(15a+5)/2(30a-20)