exam Maths Puzzle Numerical Ability

what is 10=-2/3(4x+9) how do i solve...
what is 3/4(4x-16)=3x-12 how do i solve....
what is 2(x-1)=3/5(10+5x) how do i solve.... please

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The lesser of two consecutive even integers is 10 more than one-half the greater. What are the integers? driving down a mountain, tom finds that he has descended 1800 ft in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth.