exam Maths Puzzle Numerical Ability

Solve for x:
log10 7 = log10x - log10 2

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exam Other Question

i have a test tomorrow and im strugling can u help solve this question on my review

7n+2[3(l-n)-2(1+n)=14

another question is -10+4(3p+10)=18

one more is 66=-6/5(s+3) I want to know the next four letters of this pattern: T,F,S,N,E,T