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x in (-oo:+oo)
7*(-(4*x)-9) = 133 // - 133
7*(-(4*x)-9)-133 = 0
7*(-4*x-9)-133 = 0
7*(-4*x-9)-133 = 0
-28*x-196 = 0
-28*x-196 = 0
-28*x-196 = 0 // + 196
-28*x = 196 // : -28
x = 196/(-28)
x = -7
x = -7
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