exam Maths Puzzle Numerical Ability

add or substitute this problem I do not know how or which to do Can you help? 10x+2y=7 y=5x+3

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exam Other Question

D=2M
M=B-4
B=D-17
What is the value of B?
can you please show me how to solve 2y to the second=25y+13

can you please show me how to solve 10u to the third-5u to the second=0