exam Maths Puzzle Numerical Ability

2.1x-6+1.6x=12.5
please help me i am totally lost with this problem!!!!!!

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exam Other Question

Brian and Juan road their bikes through busy city traffic and covered 26 miles in 4 hours. At the center of town, they slowed to half that pace. How long did it take them to travel the remaining 10 miles? During rush hour, Fernando can drive 35 miles using the side roads in the same time that it takes to travel 30 miles on the freeway. If Fernando�s rate on the side roads is 9 mi/h faster than his rate on the freeway, find his rate on the side roads.