simplify each expression1.4（b+8）-7b 2.-8（m+2)-19m 3.4.3（5.6+c）+9c4.83x+15（x-17) 5.3-5(a-4） 6.-5b-2（b-1）7.16-4(c+3) 8.4x-8(2x+7) 9.9-(2b-6）10.21z-（15z+10）例：7（t+8.5）-5t+3=7t+59.5-5t+4=7t-5t+59.5+4=2t +63.5—————

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