a) 8x-4,15+x=4x+15⇔8x-4x=15+4,15⇔4x=19,15⇔x=[tex] \frac{19,15}{4} =4,78[/tex]
b)3(x-1,24)+2(x+2,4)=3(x-17)⇔3x-3,72+2x+4,8=3x-51⇔2x=-52,08⇔x=-52,08/2⇒x=-26,04
c)5(x-2,6)+2(x+2,4)=3(x-1,7)⇔5x-13+2x+4,8=3x-5,1⇔4x=3,1⇒x=0,77
d)8x-15,12=4x-1,432⇔4x=13,688⇒x=3,422