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x in (-oo:+oo)
7*x+7 = 133/10 // - 133/10
7*x-(133/10)+7 = 0
7*x-133/10+7 = 0
7*x-63/10 = 0 // + 63/10
7*x = 63/10 // : 7
x = 63/10/7
x = 9/10
x = 9/10
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