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3x-2x= 4+6
x = 10
b. 5y-7 = 4y-2
5y-4y = -2+7
y = 5
c. PQ = 2x+4
= 2(10) + 4
= 20+4
= 24 cm
e. SQ = x+4y
= 10 + 4(5)
= 10 + 20
= 30 cm