Answer
$x=-1$
Work Step by Step
$17-7x+3=-3x+21-3x\ \longrightarrow$ combine like terms
$20-7x=-6x+21\ \longrightarrow$ addition property
$20-7x+7x-21=-6x+21+7x-21\ \longrightarrow$ combine like terms
$-1=x$
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