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3x+20=4x
3x-4x=-20
-x=-20
x= 20
Esa es la ecuacion... solo despejas la variable y ya :3
2x + 20 = 4x -12
2x - 4x = - 12 -20
(-1) - 2x = -32 (-1)
2x = 32
x = 32 /2
x = 16
comprobamos
36 + 16 = 4 (16) -12
52 = 64 - 12
52 = 52
Ojala te sirva :3
Meow :3