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=
=
x + 2 = 4x - 12
x - 4x = - 12 - 2
- 3x = - 14
x =
b) = 2 .
= 2.
= 2 .
=
x + 1 = 4x - 1
x - 4x = - 1 - 1
- 3x = - 2
x =