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x in (-oo:+oo)
x/10-a = 4 // - 4
x/10-a-4 = 0
1/10*x-a-4 = 0 // + -a-4
1/10*x = -(-a-4) // : 1/10
x = (-(-a-4))/1/10
x = 10*(a+4)
x = 10*(a+4)
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