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(1/2)*(10*x-4)-x-7 = 0
1/2*(10*x-4)-x-7 = 0
1/2*(10*x-4)-x-7 = 0
4*x-7-2 = 0
4*x-9 = 0
4*x-9 = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x = 9/4
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