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4*x+x-(15/2)+3/10 = -3 // + 3
4*x+x-(15/2)+3/10+3 = 0
4*x+x-15/2+3/10+3 = 0
5*x-21/5 = 0 // + 21/5
5*x = 21/5 // : 5
x = 21/5/5
x = 21/25
x = 21/25
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