5х-n=3.8х+4+1.2х. n=-7

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Substitute n=-7 into the equation:

5x - (-7) = 3.8x + 4 + 1.2x

Simplify by multiplying:

5x + 7 = 3.8x + 4 + 1.2x

Combine like terms:

5x + 7 = 5x + 4

Subtract 5x from both sides:

7 = 4

This equation is inconsistent and has no solution.