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x in (-oo:+oo)
10-(x/5) = 7-(x/2) // - 7-(x/2)
x/2-(x/5)-7+10 = 0
3/10*x+3 = 0 // - 3
3/10*x = -3 // : 3/10
x = -3/3/10
x = -10
x = -10
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