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x in (-oo:+oo)
x+x-(7/4) = 100 // - 100
x+x-(7/4)-100 = 0
x+x-7/4-100 = 0
2*x-407/4 = 0 // + 407/4
2*x = 407/4 // : 2
x = 407/4/2
x = 407/8
x = 407/8
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