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(-5/8)*(40*x-16) = 13-(6*(3-(5*x))) // - 13-(6*(3-(5*x)))
(-5/8)*(40*x-16)+6*(3-(5*x))-13 = 0
(-5/8)*(40*x-16)+6*(3-5*x)-13 = 0
6*(3-5*x)-5/8*(40*x-16)-13 = 0
6*(3-5*x)-5/8*(40*x-16)-13 = 0
28-55*x-13 = 0
15-55*x = 0
15-55*x = 0
15-55*x = 0 // - 15
-55*x = -15 // : -55
x = -15/(-55)
x = 3/11
x = 3/11
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