exam Maths Puzzle Numerical Ability

how do i solve this x2/2+2/7=-2x/7

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exam Other Question

Write the equation of the line with given slope and y- intercept. Then graph each line using the slope and y intercept.

Slope: 3/4; y-intercept: (0,8)
How many liters of a 10% alcohol solution must be mixed with 70 liters of a 90% solution to get a 30% solution?

Thanks in advance for your help!