Determine o valor de x x+12=7x+36 x/5-3=2x/15 3x/4+1/2=x/5+3/2...

X+12=7x+36
x-7x=36-12
6x=24
x=24/6
x=4

x/5-3=2x/15
(x-15)/5=2x/15
15x-225=10x
5x=225
x=225/5
x=45

3x/4+1/2=x/5+3/20
3x+2/4=4x+3/20
16x+12=40+60x
-44x=28
x=28/-44
x=-0,63

-x/3=3x/5-2
-x/3=(3×-10)/5
9x-30=5x
9x-5x=30
x=30/4
x=7,5​