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1*(4-x) = (3/4)*(x-6) // - (3/4)*(x-6)
1*(4-x)-((3/4)*(x-6)) = 0
(-3/4)*(x-6)-x+4 = 0
4-3/4*(x-6)-x = 0
4-3/4*(x-6)-x = 0
4-7/4*x+9/2 = 0
17/2-7/4*x = 0
17/2-7/4*x = 0
17/2-7/4*x = 0 // - 17/2
-7/4*x = -17/2 // : -7/4
x = -17/2/(-7/4)
x = 34/7
x = 34/7
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