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-((1/2)*x)-4/3 = -8/7 // + -8/7
-((1/2)*x)-4/3-(-8/7) = 0
(-1/2)*x-4/3+8/7 = 0
-1/2*x-4/21 = 0 // + 4/21
-1/2*x = 4/21 // : -1/2
x = 4/21/(-1/2)
x = -8/21
x = -8/21
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