4x5=74x-5=7

1
Add 55 to both sides.
4x=7+54x=7+5

2
Simplify  7+57+5  to  1212.
4x=124x=12

3
Divide both sides by 44.
x=124x=\frac{12}{4}

4
Simplify  124\frac{12}{4}  to  33.
x=3x=3

Done

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