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(4/3)*x-7 = 0.3*x+8 // - 0.3*x+8
(4/3)*x-(0.3*x)-8-7 = 0
(4/3)*x-0.3*x-8-7 = 0
1.03333333*x-15 = 0 // + 15
1.03333333*x = 15 // : 1.03333333
x = 15/1.03333333
x = 14.51612908
x = 14.51612908
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