book Maths Puzzle Numerical Ability

log(7-2x)=log(x+5)

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i have a problem... 2/7=x/-42
I know you cross multiply
7x=-84
x=-84-7
x=-91
Im i right? two cars leave the same point traveling in opposite direction. the second car travels 10 mph fasterthan the first and after 3 hours they are 330 miles apart. how fast is each car traveling?