Упростите выражения 4a+90a 86b-77b 209m+m 302n-n

4 a + 90 a = 4 * a + 90 * a = a * ( 4 + 90 ) = 94 * a = 94 a ;
86 b - 77 b = 86 * b - 77 * b = b * ( 86 - 77 ) = 9 * b = 9 b ;
209 m + m = 209 * m + m = m * ( 209 + 1 ) = 210 * m = 210 m ;
302 n - n = 302 * n - n = n * ( 302 - 1 ) * n = 301 * n = 301 n .