exam Maths Puzzle Numerical Ability

Solve each equation by the subtraction method. Determine whether the equation are independent, dependant, or inconsistent.
I do not know how to solve this problem can anyone help

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exam Other Question

5(2x-7)+3(4x-7)-(x+2)=-142

I need help on how to solve this problem?? The arm of a car windshield wiper is 32.4 cm long and is attached at the middle of a 38.1 cm blade.(Assume that the arm and blade are in line.)What area of the windshield is cleane