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(40-3x) (30-2x) = 198 * 2
1200-80x-90x + 6x square = 198 × 2
2 on both sides
3x square - 85x + 402 = 0
Factorization
（3X-67)(X-6)=0
So X1 = 67 / 3
X2=6
Calculation: 3x / x-5-2x / 5-x
It's the addition and subtraction of fractions
3x/(x-5)-2x/(5-x)
=3x/(x-5)+2x/(x-5)
=5x/(x-5)
Calculation, X (3x-2) (x + 1) - 2x (X-2) (x + 2)
X(3x-2)(x+1)-2x(x-2)(x+2)
=x(3x²+x-2)-2x(x²-4)
=3x³+x²-2x-2x³+8x
=x³+x²+6x
=x(x²+x+6)
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