book Maths Puzzle Numerical Ability

Here is the other equation I need help with: 4-(6x+6)=-(-2x+10)

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book Other Question

How would you solve a problem such as 3x-5y=-11 or x+2y=6
2x+y=-3 3x+y=8
algebraically? Also how would you write an equation of the lin 5b^3+34b^2=7b