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5*x-(4*(x+7))-((20*x)/2)+10 = 0
5*x-4*(x+7)-10*x+10 = 0
5*x-4*(x+7)-10*x+10 = 0
x-10*x-28+10 = 0
10-9*x-28 = 0
-9*x-18 = 0
-9*x-18 = 0
-9*x-18 = 0 // + 18
-9*x = 18 // : -9
x = 18/(-9)
x = -2
x = -2
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