Răspuns :
Explicație pas cu pas:
[tex](2x - 30) \div 25 + 15 = 315 \\ (2x - 30) \div 25 = 300 \\ 2x - 30 = 300 \div 25 \\ 2x - 30 = 12 \\ 2x = 12 + 30 \\ 2x = 42 \\ x = 42 \div 2 \\ x = 21[/tex]
(2x-30):25=315-15
= 300
2x-30=300•25=7500
2x=7500+30=7530
X=7530:2
X= 3765
= 300
2x-30=300•25=7500
2x=7500+30=7530
X=7530:2
X= 3765