Решите пожалуйста. 1. 4х+8=6х+4(5х+2)
2.7(2х-5)-5(4х+3)=4х
3.8-7(2-5х)-4(2х+3)=3х
4.6*2,1(х-0,3)+0,7х=2,8х+0,7
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