Question

10+x=15 , 12y=48 e 12x=144

Answer 1

10+x=15
x=15-10
x=5
12y=48
y=48/12
y=4
12x=144
x=144/12
x=12

Answer 2

Conta:
---------------------
10 + x = 15
x = 15 -10
x = 5
-----------------------
12y = 48
y = 48
     12
y= 4
-----------------------
12x = 144
x =144
      12
x = 12
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Espero ter ajudado.