(x+1)+(x+2)+(x+3)+(x+4)+(x+5)=4+5+6+7+8
5x +(1+2+3+4+5) =30
5x +15 =30
5x =30-15
5x =15
x =15:5
x =3
5x+1+2+3+4+5=30
5x+15=30
5x=15
x=3
(x+1) + ( x + 2 ) + ( x+ 3 ) + ( x + 4 ) + ( x + 5 ) = 4+ 5+6 + 7 + 8
=> (x+1) + ( x + 2 ) + ( x+ 3 ) + ( x + 4 ) + ( x + 5 ) = (3+1) + ( 3+2) + (3+3)+(3+4) + (3+5)
=> x=3
=>x+1+x+2+x+3+x+4+x+5=4+5+6+7+8=>5x+15=30=>5x=30-15=>5x=15=>x=15:5=3