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x in (-oo:+oo)
x/2+2 = 6.3 // - 6.3
x/2-6.3+2 = 0
1/2*x-4.3 = 0 // + 4.3
1/2*x = 4.3 // : 1/2
x = 4.3/1/2
x = 8.6
x = 8.6
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