Oh, dude, it's like super simple. So, to solve p = 21 + 2w, you just need to isolate w. Subtract 21 from both sides, and then divide by 2. Boom, you got your answer! It's like math magic, but without the cool cape.
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x = (P - 2W) / 2
2L+2W=P (S2w) Subtract 2W from both sides 2L=P-2W (D2) Divide both sides by 2 L=(P-2W)/2
a = L x W: area equals length times the width. p = 2L + 2W: perimeter equals 2 times the length plus 2 times the width so L = (p - 2W)/2
p = 4
p + (-13) = 8 p = 21