exam Maths Puzzle Numerical Ability

The budget deficit for the city of Gotham can be modeled by the equation
D = 1.2n + 13.5
where n is the number of years since 1990 and D is the deficit in millions of dollars

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exam Other Question

.75x+.40y=25.00
x+y=45
what am i doing wrong?
¼ = 3 - (2x-1)/(x+2)
¼ * 4(x+2) = 3 - {(2x-1)/(x+2)} *4(x+2)
x + 2 = 3 - (2x - 1)4
x + 2 = 3 - (8x - 4)
x + 2 = 7 - 8x
x + 2 - 2 = 7 - 2 - 8x
x +8x = 7 - 8x +8x
9x = 7
9x/9 = 7/9
x = 7/9