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(1/2)*x+x-7 = -127/16 // + -127/16
(1/2)*x+x-(-127/16)-7 = 0
(1/2)*x+x+127/16-7 = 0
3/2*x+15/16 = 0 // - 15/16
3/2*x = -15/16 // : 3/2
x = -15/16/3/2
x = -5/8
x = -5/8
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