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(2/15)*(x-30)+(-3/5)*x = 0
2/15*(x-30)+(-3*x)/5 = 0
(2/15*5*(x-30))/5+(-3*x)/5 = 0
2/15*5*(x-30)-3*x = 0
-7/3*x-20 = 0
(-7/3*x-20)/5 = 0
(-7/3*x-20)/5 = 0 // * 5
-7/3*x-20 = 0
-7/3*x-20 = 0 // + 20
-7/3*x = 20 // : -7/3
x = 20/(-7/3)
x = -60/7
x = -60/7
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