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x-(4/21) = 2*x-(15*x)+20/7 // - 2*x-(15*x)+20/7
x-(2*x)+15*x-(4/21)-(20/7) = 0
x-2*x+15*x-4/21-20/7 = 0
14*x-64/21 = 0 // + 64/21
14*x = 64/21 // : 14
x = 64/21/14
x = 32/147
x = 32/147
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