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x in (-oo:+oo)
x+x+7/4+2 = 66 // - 66
x+x+7/4-66+2 = 0
2*x-249/4 = 0 // + 249/4
2*x = 249/4 // : 2
x = 249/4/2
x = 249/8
x = 249/8
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