\[5x+7=4\]
1
Subtract 77 from both sides.
5x=4−75x=4-7

2
Simplify  4−74-7  to  −3-3.
5x=−35x=-3

3
Divide both sides by 55.
x=−35x=-\frac{3}{5}

Done

Decimal Form: -0.6

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