exam Maths Puzzle Numerical Ability

1.)3s+2-5s+8=
2.)4t+5r-6+2t-8r=
3.)-y+3r+2y-6+4y=

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exam Other Question

The sum of three consective odd integers is 27

Show equation.
solve -m squared= -81

(i couldnt figure out how to make the square symbol)