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4*x-10 = 2*x-(66/7) // - 2*x-(66/7)
4*x-(2*x)+66/7-10 = 0
4*x-2*x+66/7-10 = 0
2*x-4/7 = 0 // + 4/7
2*x = 4/7 // : 2
x = 4/7/2
x = 2/7
x = 2/7
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