$$\frac{7}{2}x+\frac{1}{2}x=3x+\frac{3}{2}+\frac{5}{2}$$
$x=4$
$$4x=3x+\frac{3}{2}+\frac{5}{2}$$
$$4x=3x+\frac{3+5}{2}$$
$$4x=3x+\frac{8}{2}$$
$$4x=3x+4$$
$$4x-3x=4$$
$$x=4$$
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