Algebra 1EasyFoundations ShareFoundations · Easy problemSimplify 9a−2a+1\;9a - 2a + 19a−2a+1.A7a−17a - 17a−1B7a+17a + 17a+1C7a+27a + 27a+2D14a+114a + 114a+1Check Show answer Walk through it step by step Practice more like this Review this concept