book Maths Puzzle Numerical Ability

what is the answer to 2x+(-x)+1=3(-x)+17

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book Other Question

Graph the information by drawing coordinate axes with degrees Fahrenheit, TF, along the y-axis and degrees Celsius, TC, on the x-axis. Plot the information on freezing and boiling Milk that has 5% butterfat is mixed with milk that has 2% butterfat. How much of each is needed to obtain 60 gallons of milk that has 3% butterfat? I am horrible at understanding