Question

X+16=99 ?
7.X-98=7 ?
9.(X+16) +7 =122 ?

Answer 1

x+16=99
x=99-16
x=83

7x-98=7
7x=7+98
7x=105
x=105/7
x=15

9.(x+16)+7=122
9x+144+7=122
9x=122-144-7
9x=-29
x=-29/9
x=-3,222...