book Maths Puzzle Numerical Ability

7x-8=3x+12

can you help me find x

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book Other Question

the sinhagad express left pune at noon sharp two hours latter deccan queen started from pune in the same direction. the deccan queen overtook the sinhagad express at 8 pm. find the avg speed of two train over the journey if the sum of avg speed is 70kmph Find the domain of the rational function.

2
_____
x + 3

Help please?

Thank you