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7-((7/8)*(16*x-40)) = (3/4)*(8*x-12) // - (3/4)*(8*x-12)
7-((7/8)*(16*x-40))-((3/4)*(8*x-12)) = 0
(-7/8)*(16*x-40)+(-3/4)*(8*x-12)+7 = 0
7-7/8*(16*x-40)-3/4*(8*x-12) = 0
7-7/8*(16*x-40)-3/4*(8*x-12) = 0
7-20*x+44 = 0
51-20*x = 0
51-20*x = 0
51-20*x = 0 // - 51
-20*x = -51 // : -20
x = -51/(-20)
x = 51/20
x = 51/20
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