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(1/5)*x-2 = 13/25-(0.7*x) // - 13/25-(0.7*x)
(1/5)*x+0.7*x-(13/25)-2 = 0
(1/5)*x+0.7*x-13/25-2 = 0
0.9*x-63/25 = 0 // + 63/25
0.9*x = 63/25 // : 0.9
x = 63/25/0.9
x = 2.8
x = 2.8
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