book Maths Puzzle Numerical Ability

have two problems slove for the equation by first eleminating the fraction

3m/4 + m/2= -5

Solve for the equation
0.1x+0.05(x - 300)=105

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book Other Question
Rewrite this expression with a fraction as the coefficient. -5x over 11. 20-4b
over
2 also the sqaure root of 36-9