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(2/5)*x-4 = (7/5)*x // - (7/5)*x
(2/5)*x-((7/5)*x)-4 = 0
(2/5)*x+(-7/5)*x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x = -4
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