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(2/5)*x-((7/20)*x) = 5 // - 5
(2/5)*x-((7/20)*x)-5 = 0
(2/5)*x+(-7/20)*x-5 = 0
1/20*x-5 = 0 // + 5
1/20*x = 5 // : 1/20
x = 5/1/20
x = 100
x = 100
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