book Maths Puzzle Numerical Ability

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How do I solve -7x + 4x = 9 ?

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book Other Question

Solve each system of equations graphically.

a) x+y=2
x=2y+2

b) y-x=1
2x-y=1

c)-3x+y=10
-x+y=-2
14x-2/(x-3) = 9x+8/-2