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(1/2)*x-10 = -39/4 // + -39/4
(1/2)*x-(-39/4)-10 = 0
(1/2)*x+39/4-10 = 0
1/2*x-1/4 = 0 // + 1/4
1/2*x = 1/4 // : 1/2
x = 1/4/1/2
x = 1/2
x = 1/2
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