Question

Cum sa rezolv in N ecuatiile : a)71+4*(x+2)=95 ; b)7*(2x-6)+16=72;c)36:(x-3)=4;d)(2x+5):7=9;
Va rog ajutati-ma urgent!!!

Answer 1

a) 4*(x+2)=95-71= 4*(x+2)=24 ; x+2=24:4=x+2=6; X=6-2=4

b) 7*(2x-6)=72-16 ;7*(2x-6)=56; 2x-6=56:7 ; 2x-6=8 ;2x=6+8;2x=14;x=14:2=7

c) x-3=36:4; x-3=9; x=9+3=12

d) 2x+5=9x7; 2x+5=63; 2x=63-5; 2x=58; x=58:2=29

Answer 2

$a).71+4(x+2)=95 \\ 71+4x+8=95 \\ 4x=95-71-8 \\ 4x=16 \\ x= \frac{16}{4} \\ x=4 \\ b).7(2x-6)+16=72 \\ 7(2x-6)=72-16 \\ 7(2x-6)=56 \\ 2x-6= \frac{56}{7} \\ 2x-6=8 \\ 2x=8+6 \\ 2x=14 \\ x= \frac{14}{2} \\ x=7$
$c).36:(x-3)=4 \\ x-3=4*36 \\ x-3=144 \\ x=144+3 \\ x=147 \\ d).(2x+5):7=9 \\ 2x+5=9*7 \\ 2x+5=63 \\ 2x=63-5 \\ 2x=58 \\ x= \frac{58}{2} \\ x=29$