exam Maths Puzzle Numerical Ability

D=2M
M=B-4
B=D-17
What is the value of B?

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exam Other Question

is this equation an identity, a conditional equation, or an inconsistant equation?

1 + 2 = -2
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x+5 x+3 x2+8x+15 add or substitute this problem I do not know how or which to do Can you help? 10x+2y=7 y=5x+3