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=2(5x-3 + x+7)
=2(6x+4)
=12x + 8
c. x=5
=12.5 + 8
=60+8 = 68
b. L=p.l
=(5x-3) X (x+7)
=5X2 + 35X - 3X - 21
=5X2 + 32X - 21
X=5
= 5(5)2 + 32(5) - 21
=5(25) + 160 - 21
= 125 + 160 -21 = 264