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x in (-oo:+oo)
5*(6*x+7) = 275 // - 275
5*(6*x+7)-275 = 0
5*(6*x+7)-275 = 0
30*x-240 = 0
30*x-240 = 0
30*x-240 = 0 // + 240
30*x = 240 // : 30
x = 240/30
x = 8
x = 8
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