Question

efectuati frumos calculul va rog
a)2x+7=15
b)3x-11=21
c)5+2(x-1)=12
d) 3(x-3)-8=20
e) 15-4(x+1)=10
dau 12 puncte va rog urgent!!!!!!!!!!!!!

Answer 1

a) 2X+7 = 15
2X = 15-7
2X = 8
X = 8:2
X = 4

b) 3X-11 = 21
3X = 21+11
3X = 32
X = 32:3
X = 10,(6)7

c) 5+2(x-1)=12
5+2X-2 = 12
2X = 12-3
2X = 9
X = 9:2
X = 4,5


d) 3(x-3)-8=20
3X-9-8 = 20
3X = 20+9+8
3X = 37
X = 37:3
X = 12,(3)

e) 15-4(x+1)=10
15-4X-4 = 10
-4X = 10-11
-4X = - 1
X = 1:4
X = 0,25