Question

va rog frumos ajutati-ma
rezolvati in multimea R ecuatia:
a)5x+4=25-2x
b)2z-4=8-z
c)6,5y-15=4y+3,4
d)3x-35=7x-28
e)5(x-7)=3(x-4)-13
f)3(2z+7)+4=5(z-3)

Answer 1

a)5x+4=25-2x
5x+2x=25-4
7x=21
x=3
b)2z-4=8-z
2z+z=8+4
3z=12
x=4
c)6,5y-15=4y+3,4
6,5y-4y=3,4+15
2,5y=18.4
y=7.36
d)3x-35=7x-28
3x-7x=-28+35
-4x=7
x=-1.75
e)5(x-7)=3(x-4)-13
5x-35=3x-12-13
5x-3x=-12-13+35
2x=10
x=5
f)3(2z+7)+4=5(z-3)
6z+21+4=5z-15
6z-5z=-15-21-4
z=-40