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4*x-(9/10) = -((2/5)*x)-493/10 // + -((2/5)*x)-493/10
4*x+(2/5)*x-(9/10)-(-493/10) = 0
4*x+(2/5)*x-9/10+493/10 = 0
22/5*x+242/5 = 0 // - 242/5
22/5*x = -242/5 // : 22/5
x = -242/5/22/5
x = -11
x = -11
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