6x+12 = 4x+54
6x-4x = 54-12
2x = 42
x. = 42/2
x. = 21
COMPROBACION:
6(21)+12 = 4(21)+ 54
126+12 = 84+54
138 = 138
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6x+12 = 4x+54
6x-4x = 54-12
2x = 42
x. = 42/2
x. = 21
COMPROBACION:
6(21)+12 = 4(21)+ 54
126+12 = 84+54
138 = 138