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(-1/4)*(10*x-7) = 3 // - 3
(-1/4)*(10*x-7)-3 = 0
-1/4*(10*x-7)-3 = 0
-1/4*(10*x-7)-3 = 0
-5/2*x-5/4 = 0
-5/2*x-5/4 = 0
-5/2*x-5/4 = 0 // + 5/4
-5/2*x = 5/4 // : -5/2
x = 5/4/(-5/2)
x = -1/2
x = -1/2
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