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x in (-oo:+oo)
(1/5)*x-((1/2)*n) = 7/10 // - 7/10
(1/5)*x-((1/2)*n)-(7/10) = 0
(-1/2)*n+(1/5)*x-7/10 = 0
1/5*x-1/2*n-7/10 = 0 // + -1/2*n-7/10
1/5*x = -(-1/2*n-7/10) // : 1/5
x = (-(-1/2*n-7/10))/1/5
x = 5*(7/10-(-1/2*n))
x = 5*(7/10-(-1/2*n))
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