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y/4 + 2 = 18
y/4 = 18 - 2
y/4 = 16
y = 16(4)
y = 64
...........................................................
a/8 + 3 = 12
a/8 = 12 - 3
a/8 = 9
a = 9(8)
a = 72
.............................................................
x/7 - 2 = 21
x/7 = 21 + 2
x/7 = 23
x = 23(7)
x = 161.
.......................................................................
y/a - 2 = 10
y/a = 10 + 2
y/a = 12
y = 12(a)
y = 12a ← no tiene solución.
................................................................
a/5 - 4 = 13
a/5 = 13 + 4
a/5 = 17
a = 17(5)
a = 85
.....................................................................
a/4 - 3 = 52
a/4 = 52 + 3
a/4 = 55
a = 55(4)
a = 220