V = NRT/P (your statement)

V * P = NRT/P * P (multiply by P on both sides; to get NRT on its own)

VP = NRT (simplify)

VP/NR = NRT/NR (divide by NR on both sides; to get T on its own)

VP/NR = T (simplify)

V * P = NRT/P * P (multiply by P on both sides; to get NRT on its own)

VP = NRT (simplify)

VP/NR = NRT/NR (divide by NR on both sides; to get T on its own)

VP/NR = T (simplify)

**T = VP/NR**(exchange sides)