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x in (-oo:+oo)
(1/5)*((5/2)*x-10) = 4*(x+3) // - 4*(x+3)
(1/5)*((5/2)*x-10)-(4*(x+3)) = 0
(1/5)*((5/2)*x-10)-4*(x+3) = 0
1/5*(5/2*x-10)-4*(x+3) = 0
1/5*(5/2*x-10)-4*(x+3) = 0
-7/2*x-14 = 0
-7/2*x-14 = 0
-7/2*x-14 = 0 // + 14
-7/2*x = 14 // : -7/2
x = 14/(-7/2)
x = -4
x = -4
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