book Maths Puzzle Numerical Ability

Solve the equation and describe each step to use for 7-4c=10c

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Factoring out Monomials PLEASE HELP ME OUT ????
Mr. Jones says that he has 3 daughters, the product of whose s is 72. Furthermore, the sum of their ages is equal to his house numb Could someone help me with this.
For which system or systems of equations is (2,3)the solution?
A. y = x+1 and y = -x+5
B. y = 2x - 1 and y = 1/2x +2
C. y = 3x - 3 and y = -2x + 7
D. y = 1/4x + 5/2 and y = -3x +3