book Maths Puzzle Numerical Ability

simplify 4x-5(x-7) a -x + 35 b) -x-35 c) -x-7 d) 9x+35

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I need help with this problem : 7x/-3 < 2. I know the answer is -6/7. But every time I work the problem, I come up with -4/5. Can you give me the steps? -2x+10=18