book Maths Puzzle Numerical Ability

the second side of a triangle is 8cm greater than four times the first side. the third side is two times the first side increased by six. if the perimeter is 68cm, how long is each

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i would like to know who to figure out what the measure of a regular pentagon is (so the formula to find the total number of the angles in a polygon) solve the systems of equations

3x-2y=5
-6x+4y=7