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-3.2 = (-5/7)*x // - (-5/7)*x
-((-5/7)*x)-3.2 = 0
(5/7)*x-3.2 = 0
5/7*x-3.2 = 0 // + 3.2
5/7*x = 3.2 // : 5/7
x = 3.2/5/7
x = 4.48000003
x = 4.48000003
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