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x in (-oo:+oo)
7/10-(4*x) = 2/3 // - 2/3
7/10-(4*x)-(2/3) = 0
7/10-4*x-2/3 = 0
1/30-4*x = 0 // - 1/30
-4*x = -1/30 // : -4
x = -1/30/(-4)
x = 1/120
x = 1/120
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