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OpenStudy (anonymous):
solve for x:2x + 6=4x +20
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OpenStudy (doc.brown):
\[2x+6=4x+20\]\[2x+6-6=4x+20-6\]\[2x=4x+20-6\]\[2x-4x=4x-4x+20-6\]\[2x-4x=20-6\]\[-2x=14\]\[\frac{-2x}{-2}=\frac{14}{-2}\]\[1x=-7\]\[x=-7\]check\[2x+6=4x+20\]\[2(-7)+6=4(-7)+20\]\[-14+6=-28+20\]\[-8=-8\] yup
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