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(1/3)*(6*x+9*y)+2*(5*X+7*Y) = 0
1/3*(6*x+9*y)+2*(5*X+7*Y) = 0
1/3*(6*x+9*y)+2*(5*X+7*Y) = 0
10*X+14*Y+2*x+3*y = 0
10*X+14*Y+2*x+3*y = 0
10*X+14*Y+2*x+3*y = 0 // - 10*X+14*Y+3*y
2*x = -(10*X+14*Y+3*y) // : 2
x = (-(10*X+14*Y+3*y))/2
x = (-(10*X+14*Y+3*y))/2
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