exam Maths Puzzle Numerical Ability

v-4(4-v)=-2(2v-1)

9-2m/7=19

3(x-0.87)-2x=4.98

1/2q-6=1/5q

0.56+3.4=0.26+12.4

4x-2=-8+5x

3-3(5-x)=0

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Need help with setting up formula for: An express train is 19mph faster than a freight train. The express train travels 420 miles in the same time that it takes the freight train to travel 300 miles. Find the speed of each train. In a regular hexagon, the angle measures are 5x-103, 2x+60, 7x-31, 6x-6 and 9x-100. What is the measure of x? I am confused as to how you find this since only 5 of the interior angle measures are given!