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x in (-oo:+oo)
70 = (14*x)/2 // - (14*x)/2
70-((14*x)/2) = 0
70-7*x = 0
70-7*x = 0 // - 70
-7*x = -70 // : -7
x = -70/(-7)
x = 10
x = 10
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