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(4/5)*x-(1/4) = (7/10)*x-(4/5) // - (7/10)*x-(4/5)
(4/5)*x-((7/10)*x)-(1/4)+4/5 = 0
(4/5)*x+(-7/10)*x-1/4+4/5 = 0
1/10*x+11/20 = 0 // - 11/20
1/10*x = -11/20 // : 1/10
x = -11/20/1/10
x = -11/2
x = -11/2
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