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x = x*((5*y+1)/3)+7 // - x*((5*y+1)/3)+7
x-(x*((5*y+1)/3))-7 = 0
(-1*x*(5*y+1))/3+x-7 = 0
(-1*x*(5*y+1))/3+(3*x)/3+(-7*3)/3 = 0
3*x-1*x*(5*y+1)-7*3 = 0
2*x-5*x*y-21 = 0
2*x-5*x*y-21 = 0
2*x-21 = 0 // + 21
2*x = 21 // : 2
x = 21/2
x-21/2 = 0
(x-21/2)/3 = 0
(x-21/2)/3 = 0 // * 3
x-21/2 = 0
x-21/2 = 0 // + 21/2
x = 21/2
x = 21/2
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