book Maths Puzzle Numerical Ability

please help me with this...

0.9x + 2.3x = -6.4

will you show me how you did it?

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book Other Question

Please help me to solve this problem. Is it possible to solve the problem and when we start of it is greater than , but can the answer change to less than?

4x-2(2+x)>-(3-2X) An auto service center has ten fifty-five gallon drums of 90% ethylene glycol, a common antifreeze fluid used in car radiators. The service center also has eight fifty-five gallon