book Maths Puzzle Numerical Ability

How do I solve an egaution with variables on each side like this one. . . 3x-5=7x+7

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book Other Question

Alicia,Terri,Maria,and Carla baby-sit for families in the neighborhood. They take care of different numbers of children:twin boys,three girls,two girls and a boy,and one girl and t x + y = -4

4x + y = -13

y + 3z = -10