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(2/3)*x+(3/6)*x = (1/2)*x+10 // - (1/2)*x+10
(2/3)*x+(3/6)*x-((1/2)*x)-10 = 0
(2/3)*x+(3/6)*x+(-1/2)*x-10 = 0
2/3*x-10 = 0 // + 10
2/3*x = 10 // : 2/3
x = 10/2/3
x = 15
x = 15
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