4. Пiдкресли подібні доданки у виразі. a) 3-2a+4+3a-2+a; 6) 63-b+6+ a + b - 2b - 2а;
в) x + 2x + y-x-2y-3y+ 4;
г) 3 + 2x - Зу-у + 1 - 2x.​
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