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(7*(x-2))/10-((4*(x-9))/7) = 7 // - 7
(7*(x-2))/10-((4*(x-9))/7)-7 = 0
(7*(x-2))/10+(-4/7)*(x-9)-7 = 0
(7*(x-2))/10-4/7*(x-9)-7 = 0
(7*(x-2))/10+(-4/7*10*(x-9))/10+(-7*10)/10 = 0
7*(x-2)-4/7*10*(x-9)-7*10 = 0
9/7*x-70+262/7 = 0
9/7*x-228/7 = 0
(9/7*x-228/7)/10 = 0
(9/7*x-228/7)/10 = 0 // * 10
9/7*x-228/7 = 0
9/7*x-228/7 = 0 // + 228/7
9/7*x = 228/7 // : 9/7
x = 228/7/9/7
x = 76/3
x = 76/3
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