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Angles (4x + 4°) and (6x - 4°) are supplementary.
That is :
[tex]\hookrightarrow \: 4x + 4 \degree + 6x -4 \degree = 180 \degree[/tex]
[tex]\hookrightarrow10x = 180 \degree[/tex]
[tex]\hookrightarrow x = 18 \degree[/tex]
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[tex] \mathrm{✌TeeNForeveR✌}[/tex]