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7/4-(0.5*x) = (1/3)*x+15/9 // - (1/3)*x+15/9
7/4-(0.5*x)-((1/3)*x)-(15/9) = 0
(-1/3)*x-0.5*x+7/4-5/3 = 0
1/12-0.83333333*x = 0 // - 1/12
-0.83333333*x = -1/12 // : -0.83333333
x = -1/12/(-0.83333333)
x = 0.1
x = 0.1
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