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x in (-oo:+oo)
150*(1/4) = 7*x // - 7*x
150*(1/4)-(7*x) = 0
150*(1/4)-7*x = 0
75/2-7*x = 0 // - 75/2
-7*x = -75/2 // : -7
x = -75/2/(-7)
x = 75/14
x = 75/14
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