6(3x-4)-4(2x-5)=30 . How?
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6(3x - 4) - 4(2x -5) = 30
=> 18x - 24 - 8x + 20 = 30
=> 18x -8x - 24 +20 = 30
=> 10x - 4 = 30
=> 10x = 30 + 4
=> 10x = 34
=> x = 34/10
=> x = 17/5
Now,
Putting x = 17/5
=> 6(3 × 17/5 - 4) - 4(2 × 17/5 -5)
=> 6(51/5 - 4) -4(34/5 - 5)
=> 6 × 31/5 - 4 × 9/5
=> 186/5 - 36/5
=> 150/5
=> 30
=> 18x - 24 - 8x + 20 = 30
=> 18x -8x - 24 +20 = 30
=> 10x - 4 = 30
=> 10x = 30 + 4
=> 10x = 34
=> x = 34/10
=> x = 17/5
Now,
Putting x = 17/5
=> 6(3 × 17/5 - 4) - 4(2 × 17/5 -5)
=> 6(51/5 - 4) -4(34/5 - 5)
=> 6 × 31/5 - 4 × 9/5
=> 186/5 - 36/5
=> 150/5
=> 30
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