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w in (-oo:+oo)
(-2/7)*w+4*w+10 = 36 // - 36
(-2/7)*w+4*w-36+10 = 0
26/7*w-26 = 0 // + 26
26/7*w = 26 // : 26/7
w = 26/26/7
w = 7
w = 7
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