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x in (-oo:+oo)
(-1/2)*x = 3*M-x // - 3*M-x
(-1/2)*x-(3*M)+x = 0
(-1/2)*x-3*M+x = 0
1/2*x-3*M = 0 // + -3*M
1/2*x = -(-3*M) // : 1/2
x = (-(-3*M))/1/2
x = 6*M
x = 6*M
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