book Maths Puzzle Numerical Ability

Can you please help me with this equation: 6y+7=3+2(y-4)

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Following an earthquake, two seismologists inspect the surface rupture of the fault that generated the earhtquake. When they are finished collecting data, they get in their cars at A square animal pen and a pen shaped like an equilateral triangle have equal perimeters. Find the length of the sides of each pen if the sides of the triangular pen are sixteen les