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w in (-oo:+oo)
2-6*w = 7*w+145 // - 7*w+145
2-6*w-(7*w)-145 = 0
2-6*w-7*w-145 = 0
-13*w-143 = 0 // + 143
-13*w = 143 // : -13
w = 143/(-13)
w = -11
w = -11
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