Question

Aflati x apartine lui N

A)3(2x-1)=141
B)8x+10=6x+18
C)29-5(x+1)=4
D)2(3x-1)=3(x+2)+4
E)[37-(x+1)*3]*2=14
F)[(x-3)*2+7]:5=15

Answer 1

$a).3(2x-1)=141 \\ 6x-3=141 \\ 6x=141+3 \\ 6x=144 \\ x= \frac{144}{6} \\ x=24 \\ b).8x+10=6x+18 \\ 8x-6x=18-10 \\ 2x=8 \\ x= \frac{8}{2} \\ x=4$
$c).29-5(x+1)=4 \\ 29-5x-5=4 \\ -5x=4-29+5 \\ -5x=-20 \\ x= \frac{-20}{-5} \\ x=4 \\ d).2(3x-1)=3(x+2)+4 \\ 6x-2=3x+6+4 \\ 6x-3x=6+4+2 \\ 3x=12 \\ x= \frac{12}{3} \\ x=4$
$e).[37-(x+1)*3]*2=14 \\ (37-3x-3)*2=14 \\ 37-3x-3= \frac{14}{2} \\ 37-3x-3=7 \\ -3x=7-37+3 \\ -3x=-27 \\ x= \frac{-27}{-3} \\ x=9$
$f).[(x-3)*2+7]:5=15 \\ (2x-6+7):5=15 \\ 2x-6+7=15*5 \\ 2x-6+7=75 \\ 2x=75+6-7 \\ 2x=74 \\ x= \frac{74}{2} \\ x=37$