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w in (-oo:+oo)
7*(5*w+10) = 210 // - 210
7*(5*w+10)-210 = 0
7*(5*w+10)-210 = 0
35*w-140 = 0
35*w-140 = 0
35*w-140 = 0 // + 140
35*w = 140 // : 35
w = 140/35
w = 4
w = 4
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