$$3x-4=5+5+3( \frac{ x }{ 5 } -1)$$
$x = \frac{55}{12} = 4\frac{7}{12} \approx 4.583333333$
$$15x-20=25+25+15\left(\frac{x}{5}-1\right)$$
$$15x-20=50+15\left(\frac{x}{5}-1\right)$$
$$15x-20=50+15\times \frac{x}{5}-15$$
$$15x-20=50+3x-15$$
$$15x-20=35+3x$$
$$15x-20-3x=35$$
$$12x-20=35$$
$$12x=35+20$$
$$12x=55$$
$$x=\frac{55}{12}$$
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