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(1/2)*x-4*2 = -15/4 // + -15/4
(1/2)*x-4*2-(-15/4) = 0
(1/2)*x-4*2+15/4 = 0
1/2*x-17/4 = 0 // + 17/4
1/2*x = 17/4 // : 1/2
x = 17/4/1/2
x = 17/2
x = 17/2
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