book Maths Puzzle Numerical Ability

If the larger of two numbers is 5 morn than the smaller. The smaller number plus twice the larger equals 100

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book Other Question

how is y=5x+6 similar to -18x+3y=-54 SCRATCH WORK PLEASE
5x+t=17
7x-k=8
4-2x=g
15+3x=u
a+6x=c
b-7x=n
ax-b=k
hx+j=r
2x=4a+2b