4x=12 by the trial n error method
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4x=12 means x=3 put value of x in the equation satisfying it this is hit and trial method
X =3
X =3
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trial-》 4x=12
x=12÷4
x=3
error-》4x=12 CANNOT BE DONE IN ERROR
x=12÷4
x=3
error-》4x=12 CANNOT BE DONE IN ERROR
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