Explain please, maths is my weekness

[tex]\huge{\tt{αηsωεя:-}}[/tex]
[tex] \huge A) \: T = \frac{PV}{nR} [/tex]
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[tex]\large\bf{\underline{Given\: equation}}[/tex]
[tex]⟹PV = nRT[/tex]
[tex]\large\bf{\underline{So}}[/tex]
[tex]⟹nRT = PV[/tex]
[tex]⟹T = \frac{PV}{nR} [/tex]
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[tex]\large\bf{\underline{Hence}}[/tex]
[tex]\large\bf{⟹T = \frac{PV}{nR}} [/tex]