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4*(x-7) = 5*x-(1/2) // - 5*x-(1/2)
4*(x-7)-(5*x)+1/2 = 0
4*(x-7)-5*x+1/2 = 0
(2*4*(x-7))/2+(-5*2*x)/2+1/2 = 0
2*4*(x-7)-5*2*x+1 = 0
1-2*x-56 = 0
-2*x-55 = 0
(-2*x-55)/2 = 0
(-2*x-55)/2 = 0 // * 2
-2*x-55 = 0
-2*x-55 = 0 // + 55
-2*x = 55 // : -2
x = 55/(-2)
x = -55/2
x = -55/2
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