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x in (-oo:+oo)
2*x-(10/5) = 4 // - 4
2*x-(10/5)-4 = 0
2*x-4-2 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x = 3
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