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(1/5)*x-2 = 13/25-0.7 // - 13/25-0.7
(1/5)*x-(13/25)-2+0.7 = 0
(1/5)*x-13/25-2+0.7 = 0
1/5*x-1.82 = 0 // + 1.82
1/5*x = 1.82 // : 1/5
x = 1.82/1/5
x = 9.1
x = 9.1
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