"m<\\textrm{SXT} = m<\\textrm{QXS} + m<\\textrm{QXT}\\\\\n\n\n\n\\Rightarrow 125 + 2x - 2 = 4x + 1 \\\\\n\n125 - 2 - 1 = 4x - 2x \\\\\n\n2x = 122\\\\\n\nx = 61\\degree\\\\\n\n\n\n\\therefore m<\\textrm{QXS} = 2x - 2 = 2(61) - 2 = 122 - 2 = 120\\degree"
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