==> 7x - 4 = 3 + 8x
==> 8x - 7x = -4 - 3
==> x = -7 [ Ans ]
It takes 20 minutes to make 4 model airplanes. How many model airplanes can be made in 2 hours?
2 answers:
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==> 7x - 4 = 3 + 8x
==> 8x - 7x = -4 - 3
==> x = -7 [ Ans ]