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(2/5)*x-10 = -72/7 // + -72/7
(2/5)*x-(-72/7)-10 = 0
(2/5)*x+72/7-10 = 0
2/5*x+2/7 = 0 // - 2/7
2/5*x = -2/7 // : 2/5
x = -2/7/2/5
x = -5/7
x = -5/7
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