Question

cum rezolv ecuatile in R
a)3x-7=5x+9
b)2x-1=6x+7
c)7-2x=5-4x
d)3-5x=7x+15
e)8x+3=10x+7
f)2x-5=7x+25
va rog mult ajutatima
MULTUMESC!

Answer 1

a)
3x-7=5x+9
3x - 5x = 9 + 7 
-2x = 16
x = 16 : (-2)
x = -8 

b)
2x-1=6x+7
2x - 6x = 7+1
-4x=8
x=8 :(-4)
x=- 2

c)
7-2x=5-4x
-2x +4x = 5 - 7 
2x = -2
x = -2 : 2 
x = - 1

d)
3-5x=7x+15
-5x - 7x = 15 -3
-12x=12
x=12 : (-12)
x= - 1

e)
8x+3=10x+7
8x - 10x = 7 - 3
-2x = 4 
x = 4 :(-2)
x = -2 
f)
2x-5=7x+25
2x -7x = 25+5
-5x = 30
x = 30:(-5)
x = - 6