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(2/5)*x-(3/4) = -x-(7/10) // + -x-(7/10)
(2/5)*x+x-(3/4)+7/10 = 0
(2/5)*x+x-3/4+7/10 = 0
7/5*x-1/20 = 0 // + 1/20
7/5*x = 1/20 // : 7/5
x = 1/20/7/5
x = 1/28
x = 1/28
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