Answer:
No1.
let x represent number of ice cream cones
80=12+4x
80-12=4x
68=4x
x=68/4
x=17
Check:
12+4(17)
=12 +68=80
3. 5x+14=9
collect like terms
5x=9-14
5x=-5
x=-5/5
x= -1
check:
5(-1)+14= -5+14 =9
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