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(1/2)*x-1 = -9/10 // + -9/10
(1/2)*x-(-9/10)-1 = 0
(1/2)*x+9/10-1 = 0
1/2*x-1/10 = 0 // + 1/10
1/2*x = 1/10 // : 1/2
x = 1/10/1/2
x = 1/5
x = 1/5
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