$$3E+2R=270$$
$E=-\frac{2R}{3}+90$
$$3E=270-2R$$
$$\frac{3E}{3}=\frac{270-2R}{3}$$
$$E=\frac{270-2R}{3}$$
$$E=-\frac{2R}{3}+90$$
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$R=-\frac{3E}{2}+135$
$$2R=270-3E$$
$$\frac{2R}{2}=\frac{270-3E}{2}$$
$$R=\frac{270-3E}{2}$$
$$R=-\frac{3E}{2}+135$$
