Respuesta :
Answer: x=-3/4
Step-by-step explanation:
12-x=15+3x
12-x+x=15+3x+x
12=15+4x
12-15=15-15+4x ==> isolate the variable x.
-3=4x
4x/4=-3/4
x=-3/4
Answer: x=-3/4
Step-by-step explanation:
12-x=15+3x
12-x+x=15+3x+x
12=15+4x
12-15=15-15+4x ==> isolate the variable x.
-3=4x
4x/4=-3/4
x=-3/4