Question

Calculați:
URGENT!!!!! DAU COROANA

Answer 1

a) 2x+7/3=-6/9
2x+7/3=-2/3
2x=-2/3-7/3
2x=-9/3
2x=-1/3
x=-1/6

b) 5x+3x-18=7x+13
8x-18=7x+13
8x-7x=18+13
x=31

c) (x+3)/7-5/2=x/2-5
2(x+3)-5=x-10
2x+6-5=x-10
2x-x=-10-1
x=-11

d)2x-6*5=3(1-x)-6*3
2x-30=3-3x-18
2x+3x=30+3-18
5x=15
x=15/5
x=3

e)2(2x-1)-3(x-5)=5x+8-3(2x-7)
4x-2-3x+15=5x+8-6x+21
7x+13=-x+29
7x+x=29-13
8x=16
x=16/8
x=2

f) cazul 1: x aparţine (-infinit; -1/2]
-2x-1=5
-2x=1+5
-2x=6
x=-6/2
x=-3

cazul 2: x aparţine (-1/2;infinit)
2x+1=5
2x=5-1
2x=4
x=4/2
x=2

soluţiile ecuaţiei sunt x=-3 şi x=2