exam Maths Puzzle Numerical Ability

Solve the following 2 x 2 systems using substitutions
2x - 5y= 21
7x + 3y = 53

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exam Other Question

Multiply. (-1/10) (40)
This problem the -1/10 are in "longer" parenthesis's. Am not sure what they are called but they are not {[ help Solve the equation:
x/4 -1= x/5
I dont understand at all how to do it.