$$(x+ { 1 }^{ 3 } )-(x+ { 1 }^{ 2 } )-30(x+1)+72$$
$42-30x$
$$x+1-\left(x+1^{2}\right)-30\left(x+1\right)+72$$
$$x+1-\left(x+1\right)-30\left(x+1\right)+72$$
$$x+1-x-1-30\left(x+1\right)+72$$
$$1-1-30\left(x+1\right)+72$$
$$-30\left(x+1\right)+72$$
$$-30x-30+72$$
$$-30x+42$$
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