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x in (-oo:+oo)
(-8/7)*x = -40.8 // + 40.8
(-8/7)*x+40.8 = 0
40.8-8/7*x = 0 // - 40.8
-8/7*x = -40.8 // : -8/7
x = -40.8/(-8/7)
x = 35.70000009
x = 35.70000009
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