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(9/10)*x-(2/5) = 4 // - 4
(9/10)*x-(2/5)-4 = 0
(9/10)*x-2/5-4 = 0
9/10*x-22/5 = 0 // + 22/5
9/10*x = 22/5 // : 9/10
x = 22/5/9/10
x = 44/9
x = 44/9
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