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x in (-oo:+oo)
a*((7*x)/8)-(3*a)-(a*((6*x)/8))-(7*a) = 0
(-3/4)*a*x-3*a-7*a+a*((7*x)/8) = 0
1/8*a*x-10*a = 0 // + -10*a
1/8*a*x = -(-10*a) // : 1/8*a
x = (-(-10*a))/(1/8*a)
x = 80
x = 80
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